--- title: "Kids' Cavities, Fluoride and Sealants: A Parent Guide" description: "How to protect children's teeth: what causes baby tooth cavities, how fluoride works, toothpaste amounts by age, what sealants are, and local water data." url: https://towncenterdental.multisites.ai/guides/kids-cavities-and-fluoride publisher: Town Center Dental phone: +1-636-273-5866 quote: https://towncenterdental.multisites.ai/request-appointment --- # Kids' Cavities, Fluoride and Sealants: How Do I Protect Baby and Adult Teeth? Cavities start when germs in the mouth feed on sugar and make acid that harms enamel. Fluoride makes enamel stronger. Sealants cover the grooves of back teeth. Daily brushing with fluoride toothpaste, sensible drinks and snacks, and regular dental visits help protect baby and adult teeth. Your dentist will advise on your child. GuideUpdated October 26, 20268 min read 1. 1 ## Cavities start early The AAP says 23% of all kids will get cavities before their fifth birthday. 2. 2 ## Fluoride strengthens enamel The ADA says fluoride helps prevent tooth decay by making enamel stronger and more resistant to cavities. 3. 3 ## Sealants cover the grooves NIDCR says sealants are thin plastic coatings on the chewing surfaces of children's back teeth. The ADA says they have been shown to reduce the risk of decay by nearly 80% in molars. 4. 4 ## Right amount by age The ADA says a grain-of-rice amount of fluoride toothpaste under age 3, and a pea-sized amount for ages 3 to 6. ## Why do kids get cavities? Cavities form when bacteria in the mouth make acid that harms enamel. NIDCR says tooth decay begins when bacteria in your mouth make acids that attack the surface of the tooth, which is the enamel. NIDCR says that when decay-causing bacteria meet sugars and starches from foods and drinks, they form acid. Even babies can get cavities. The AAP says 23% of all kids will get cavities before their fifth birthday. It also says even the natural sugars in breast milk and formula can start the process. Baby teeth are small and their enamel is thin, so decay can move quickly. This is not about blame. Most parents are doing their part. The goal is to know what raises the risk and what lowers it. Our guide on [cavities](https://towncenterdental.multisites.ai/guides/cavities-explained) explains how decay works in teeth of any age. ## What is early childhood caries? [Early childhood caries](https://towncenterdental.multisites.ai/glossary/early-childhood-caries) means tooth decay in a very young child. NIDCR says young children are at risk for early childhood caries, sometimes called baby bottle tooth decay, which starts in the baby’s front teeth and extends to the back teeth. The AAP lists habits that raise the risk. Putting a child to sleep with a bottle lets sugars from formula and breast milk linger on the teeth. Letting a child sip sweet drinks through the day does the same. A clean, damp cloth on the gums after meals, brushing as soon as teeth appear, and water between meals are simple counters. The next table sets out habits that help and habits that raise risk. Habit Effect on teeth Better choice Bottle in bed with milk or formula Sugars sit on teeth for hours Water only if a bottle is needed at bedtime Juice, soda or sweet drinks Sugar bathes teeth, per AAP Water, and milk at meals Sticky snacks (raisins, gummies, fruit snacks) Cling to teeth, per AAP Rinse or brush after, or choose other snacks Constant sipping and snacking Teeth are under acid attack all day Set meal and snack times Brushing skipped at night Plaque sits overnight Brush last, after the final snack or drink ## What do early cavities in a child’s teeth look like? Early signs can be easy to miss. The AAP lists white spots on the teeth as a sign that the tooth is losing the calcium and minerals that keep it strong. It lists tan, brown or black spots, or pits, as a sign that the tooth is decaying. NIDCR adds that in early decay there are usually no symptoms, so a child may not complain. That is why regular dental visits matter. A dentist can find early spots before they turn into holes, when fluoride and good care may help the enamel. If you see a white, brown or black spot on your child’s tooth, or a small pit, make an appointment. Do not wait for pain. ## Which drinks and snacks are friendlier to teeth? Water is the drink to choose every day. The AAP says regular tap water, which usually contains fluoride, is the healthiest drink for your child’s teeth. It also says fruit juice, soda and sweetened drinks are not good for a little one’s teeth, and that after age one, juice should be limited to 4 ounces a day and mixed with water. Sticky snacks can cling to teeth. The AAP lists raisins and other dried fruits, gummy candies, taffy, fruit roll-ups and snack bars with honey or molasses. If your child eats them, have them brush or rinse with water afterward. Timing matters as much as the food. A snack at a set time causes one acid attack. Sipping or grazing all day causes many. Plan meals and snacks, and offer water between them. ## How does fluoride protect teeth? Fluoride makes enamel stronger and helps repair early damage. The ADA says fluoride is a naturally occurring mineral that helps prevent tooth decay by making the surface of the teeth stronger and more resistant to cavities. It also says fluoride helps repair the damage acids can do, a process called remineralization. For young children, the ADA says teeth benefit from fluoride even before they break through the gums, through the food and drink a child takes in. Once teeth are in, fluoride toothpaste, fluoride in drinking water and treatments at the dentist all add to the protection. NIDCR says enamel can repair itself using minerals from saliva and fluoride from toothpaste, or from fluoride applied by a dentist or hygienist. That repair works at the early stage, before a hole forms. After a cavity forms, the tooth needs treatment. NIDCR says dentists commonly treat cavities by filling them. You can read about [dental fillings](https://towncenterdental.multisites.ai/services/dental-fillings) on the practice’s page. ## Is fluoride safe for children? The ADA says that for more than 70 years the scientific evidence has shown that adding fluoride to community water supplies is safe and effective. The AAP also describes fluoride as a safe and useful cavity-fighting ingredient. Both stress using the right amount. Amounts matter, because young children may swallow toothpaste. The ADA says to supervise children aged 3 to 6 so that they use the right amount and do not swallow too much. It also says children under age 6 should not use mouthwash unless a dentist recommends it, since they may swallow it instead of spitting. If you have a question about fluoride for your child, ask your dentist or your child’s doctor. They know your child’s health and water source. [Community water fluoridation](https://towncenterdental.multisites.ai/glossary/community-water-fluoridation) is a public health topic, and you may see debate about it. Look for sources you can check. ## How much fluoride toothpaste should a child use? Use a small amount, and add help as your child grows. The ADA gives this guide by age. Age Amount of fluoride toothpaste Who brushes Teeth appear to age 3 A small smear, about the size of a grain of rice A parent brushes twice a day Ages 3 to 6 A pea-sized amount Child brushes, parent supervises, twice a day for two minutes Older children and teens Fluoride toothpaste in a twice-daily routine Child brushes, with reminders The ADA says to teach children to spit out toothpaste. The AAP says to teach your child to spit without rinsing. If your child is under 6, skip fluoride mouthwash unless your dentist suggests it. ## Does our water have fluoride? It depends on your water supply. The AAP says to check with your local water utility to find out if your water has fluoride. The ADA says the current recommendation is that communities adjust fluoride levels to 0.7 milligrams per liter of water. For one local data point: Missouri American Water reported 0.59 ppm fluoride in its 2025 annual water quality report, with a range of 0.49 to 0.59 ppm (report dated March 27, 2026). That is a report number, not a judgment, and it covers the system named in the report. Your own address may be served by a different supplier, and some homes use private wells. Check your water bill or call your utility to learn which report applies to you. If your home uses a private well, the AAP says to ask your doctor whether your child should have a prescription for fluoride drops or chewable tablets. The ADA says such supplements may help children aged 6 months to 16 years who live where fluoride is not added to local water. Your dentist or pediatrician can advise you. ## What are fluoride varnish and in-office fluoride treatments? These are fluoride products applied by a dental team. The ADA says a dentist may apply fluoride directly to the teeth during a visit, and that this treatment is often recommended for children to prevent early cavities. The AAP says a pediatrician or dentist may apply fluoride varnish two to four times a year, and that it can continue as a child grows. [Fluoride varnish](https://towncenterdental.multisites.ai/glossary/fluoride-varnish) is a surface treatment painted on the teeth. Ask your dentist whether it fits your child, and how often. The practice’s family dentistry text mentions fluoride treatment for children as something it may recommend. ## What are dental sealants, and who needs them? Sealants are thin protective coatings on the chewing surface of back teeth. NIDCR says they are thin plastic coatings that protect the chewing surfaces of children’s back teeth from cavities. The pits and grooves on those teeth can trap food and germs that a toothbrush cannot reach. The ADA says sealants have been shown to reduce the risk of decay by nearly 80% in molars, and that they are no substitute for brushing and flossing. Sealants can even be placed over areas of early decay to prevent further damage, so a dentist can watch the tooth. Question Answer from the ADA and NIDCR Which teeth? The chewing surfaces of back teeth (molars) When? As soon as permanent molars come in: first molars around age 6, second molars around age 12 How are they put on? The tooth is cleaned and dried, a gel roughens it, and the sealant is painted on and hardened with a blue light How long do they last? Often several years; the dentist checks them at visits Side effects? The ADA says there are no known side effects, apart from a possible allergy Who covers them? NIDCR says some medical insurance (including Medicaid) and almost all dental insurance pay for sealants; check your plan The practice describes its approach on its [dental sealants page](https://towncenterdental.multisites.ai/services/dental-sealants). Our [insurance and financing page](https://towncenterdental.multisites.ai/patients/insurance-and-financing) shows how to ask about coverage. ## How often should kids see the dentist? It depends on your child’s risk. The AAP says that at the first visit, the dentist can check your child’s teeth and set the frequency of future checkups. Regular visits catch early decay, when treatment is simplest, since NIDCR says early decay usually has no symptoms. Read about timing and what to expect in our guide to your [child’s first dental visit](https://towncenterdental.multisites.ai/guides/childs-first-dental-visit). ## Next step Learn how the practice describes care for children on its [dentistry for kids page](https://towncenterdental.multisites.ai/services/dentistry-for-kids). Then call (636) 273-5866, Monday to Thursday, or [request an appointment](https://towncenterdental.multisites.ai/request-appointment). Bring your child’s toothpaste and ask the team to check the amount and technique. ## Frequently asked questions ### Is fluoride good or bad for kids? The ADA says fluoride helps prevent tooth decay by making enamel stronger, and that evidence for more than 70 years shows adding it to community water is safe and effective. Use the right amount of toothpaste for your child's age and ask your dentist or pediatrician about your child's needs. ### What is a dental sealant for kids? NIDCR says sealants are thin plastic coatings that protect the chewing surfaces of children's back teeth from cavities. They are painted on as a liquid and harden quickly. NIDCR says they are put on as soon as permanent molars come in, around age six for the first molars. ### How much fluoride toothpaste should my child use? The ADA says to use a small smear about the size of a grain of rice once baby teeth appear, until age 3. For ages 3 to 6, use a pea-sized amount, brush twice a day for two minutes, and supervise so your child does not swallow too much toothpaste. ### Can an early cavity be stopped? NIDCR says that in early decay, a white spot may appear where enamel has lost minerals, and that enamel can repair itself using minerals from saliva and fluoride. Once a hole forms, treatment is needed. Only a dentist can tell which stage a tooth is in, so keep regular visits. ### Does my tap water have fluoride? Check with your water utility or a water report. Missouri American Water reported 0.59 ppm fluoride in its 2025 water quality report, with a range of 0.49 to 0.59 ppm. The ADA lists 0.7 mg per liter as the recommended level. If you use a private well, ask your dentist or pediatrician. ## Terms on this page - [Community water fluoridation](https://towncenterdental.multisites.ai/glossary/community-water-fluoridation) - [Mouthwash (mouth rinse)](https://towncenterdental.multisites.ai/glossary/mouthwash-mouth-rinse) - [Cavity (dental caries)](https://towncenterdental.multisites.ai/glossary/cavity-dental-caries) - [Early childhood caries](https://towncenterdental.multisites.ai/glossary/early-childhood-caries) - [Fluoride toothpaste](https://towncenterdental.multisites.ai/glossary/fluoride-toothpaste) - [Fluoride treatment](https://towncenterdental.multisites.ai/glossary/fluoride-treatment) - [Dental insurance](https://towncenterdental.multisites.ai/glossary/dental-insurance) - [Fluoride varnish](https://towncenterdental.multisites.ai/glossary/fluoride-varnish) - [Remineralization](https://towncenterdental.multisites.ai/glossary/remineralization) - [Gums (gingiva)](https://towncenterdental.multisites.ai/glossary/gums-gingiva) ## Sources 1. [ADA MouthHealthy: Fluoride (what it does)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 2. [ADA MouthHealthy: Fluoride (repair)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 3. [ADA MouthHealthy: Fluoride (remineralization)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 4. [ADA MouthHealthy: Fluoride (safe and effective)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 5. [ADA MouthHealthy: Fluoride (recommended level)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 6. [ADA MouthHealthy: Fluoride (before teeth appear)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 7. [ADA MouthHealthy: Fluoride (under 3)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 8. [ADA MouthHealthy: Fluoride (ages 3 to 6)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 9. [ADA MouthHealthy: Fluoride (mouthwash)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 10. [ADA MouthHealthy: Fluoride (in-office treatment)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 11. [ADA MouthHealthy: Fluoride (supplements)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 12. [ADA MouthHealthy: Baby Teeth (sugar and drinks)](https://www.mouthhealthy.org/all-topics-a-z/baby-teeth) 13. [ADA MouthHealthy: Sealants (what they are)](https://www.mouthhealthy.org/all-topics-a-z/sealants) 14. [ADA MouthHealthy: Sealants (early decay)](https://www.mouthhealthy.org/all-topics-a-z/sealants) 15. [ADA MouthHealthy: Sealants (how long they last)](https://www.mouthhealthy.org/all-topics-a-z/sealants) 16. [ADA MouthHealthy: Sealants (no substitute)](https://www.mouthhealthy.org/all-topics-a-z/sealants) 17. [ADA MouthHealthy: Sealants (side effects)](https://www.mouthhealthy.org/all-topics-a-z/sealants) 18. [NIDCR: Dental Sealants (what they are)](https://www.nidcr.nih.gov/health-info/dental-sealants) 19. [NIDCR: Dental Sealants (when)](https://www.nidcr.nih.gov/health-info/dental-sealants) 20. [NIDCR: Dental Sealants (application)](https://www.nidcr.nih.gov/health-info/dental-sealants) 21. [NIDCR: Dental Sealants (where)](https://www.nidcr.nih.gov/health-info/dental-sealants) 22. [NIDCR: Dental Sealants (coverage)](https://www.nidcr.nih.gov/health-info/dental-sealants) 23. [NIDCR: Tooth Decay (how decay begins)](https://www.nidcr.nih.gov/health-info/tooth-decay) 24. [NIDCR: Tooth Decay (white spot)](https://www.nidcr.nih.gov/health-info/tooth-decay) 25. [NIDCR: Tooth Decay (enamel repair)](https://www.nidcr.nih.gov/health-info/tooth-decay) 26. [NIDCR: Tooth Decay (early symptoms)](https://www.nidcr.nih.gov/health-info/tooth-decay) 27. [NIDCR: Tooth Decay (filling)](https://www.nidcr.nih.gov/health-info/tooth-decay) 28. [AAP HealthyChildren: Baby Teeth (cavities by age 5)](https://www.healthychildren.org/English/ages-stages/baby/teething-tooth-care/Pages/How-to-Prevent-Tooth-Decay-in-Your-Baby.aspx) 29. [AAP HealthyChildren: Baby Teeth (natural sugars)](https://www.healthychildren.org/English/ages-stages/baby/teething-tooth-care/Pages/How-to-Prevent-Tooth-Decay-in-Your-Baby.aspx) 30. [AAP HealthyChildren: Baby Teeth (no bottles in bed)](https://www.healthychildren.org/English/ages-stages/baby/teething-tooth-care/Pages/How-to-Prevent-Tooth-Decay-in-Your-Baby.aspx) 31. [AAP HealthyChildren: Baby Teeth (sugary drinks)](https://www.healthychildren.org/English/ages-stages/baby/teething-tooth-care/Pages/How-to-Prevent-Tooth-Decay-in-Your-Baby.aspx) 32. [AAP HealthyChildren: Baby Teeth (sticky foods)](https://www.healthychildren.org/English/ages-stages/baby/teething-tooth-care/Pages/How-to-Prevent-Tooth-Decay-in-Your-Baby.aspx) 33. [AAP HealthyChildren: Baby Teeth (tap water)](https://www.healthychildren.org/English/ages-stages/baby/teething-tooth-care/Pages/How-to-Prevent-Tooth-Decay-in-Your-Baby.aspx) 34. [AAP HealthyChildren: Baby Teeth (fluoride varnish)](https://www.healthychildren.org/English/ages-stages/baby/teething-tooth-care/Pages/How-to-Prevent-Tooth-Decay-in-Your-Baby.aspx) 35. [AAP HealthyChildren: Good Oral Health Starts Early (private wells)](https://www.healthychildren.org/English/healthy-living/oral-health/Pages/Brushing-Up-on-Oral-Health-Never-Too-Early-to-Start.aspx) 36. [AAP HealthyChildren: Good Oral Health Starts Early (check your water)](https://www.healthychildren.org/English/healthy-living/oral-health/Pages/Brushing-Up-on-Oral-Health-Never-Too-Early-to-Start.aspx) 37. [Missouri DNR: 2025 Annual Water Quality Report, Missouri American Water (MO6010716)](https://dnr.mo.gov/ccr/MO6010716.pdf) 38. [NIDCR: Tooth Decay (early childhood caries)](https://www.nidcr.nih.gov/health-info/tooth-decay) 39. [NIDCR: Tooth Decay (pattern)](https://www.nidcr.nih.gov/health-info/tooth-decay) 40. [NIDCR: Tooth Decay (acid)](https://www.nidcr.nih.gov/health-info/tooth-decay) 41. [AAP HealthyChildren: Good Oral Health Starts Early (fluoride is safe)](https://www.healthychildren.org/English/healthy-living/oral-health/Pages/Brushing-Up-on-Oral-Health-Never-Too-Early-to-Start.aspx) 42. [AAP HealthyChildren: Good Oral Health Starts Early (spit without rinsing)](https://www.healthychildren.org/English/healthy-living/oral-health/Pages/Brushing-Up-on-Oral-Health-Never-Too-Early-to-Start.aspx) 43. [AAP HealthyChildren: Good Oral Health Starts Early (white spots)](https://www.healthychildren.org/English/healthy-living/oral-health/Pages/Brushing-Up-on-Oral-Health-Never-Too-Early-to-Start.aspx) 44. [AAP HealthyChildren: Good Oral Health Starts Early (brown spots)](https://www.healthychildren.org/English/healthy-living/oral-health/Pages/Brushing-Up-on-Oral-Health-Never-Too-Early-to-Start.aspx) 45. [AAP HealthyChildren: Baby Teeth (juice)](https://www.healthychildren.org/English/ages-stages/baby/teething-tooth-care/Pages/How-to-Prevent-Tooth-Decay-in-Your-Baby.aspx) 46. [ADA MouthHealthy: Fluoride (swallowing mouthwash)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 47. [ADA MouthHealthy: Fluoride (ages 3 to 6 brushing)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 48. [ADA MouthHealthy: Fluoride (older children)](https://www.mouthhealthy.org/all-topics-a-z/fluoride) 49. [ADA MouthHealthy: Sealants (molar ages)](https://www.mouthhealthy.org/all-topics-a-z/sealants) 50. [ADA MouthHealthy: Sealants (gel)](https://www.mouthhealthy.org/all-topics-a-z/sealants) 51. [ADA MouthHealthy: Sealants (light)](https://www.mouthhealthy.org/all-topics-a-z/sealants) 52. [NIDCR: Dental Sealants (pits and grooves)](https://www.nidcr.nih.gov/health-info/dental-sealants) Written by Town Center Dental and checked against the sources above on October 26, 2026. Dental guidance changes, so check the linked page, and ask your dentist about your own care. ## Keep reading - [Your Child's First Dental Visit: When To Start, What To Expect, and When Teeth Come and GoThe ADA and the AAP say to schedule your child's first dental visit after the first tooth appears and no later than the first birthday. Most visits are short. The dentist checks the teeth and gums, talks about cleaning and habits, and plans future check-ups. Baby teeth start to come in around 6 months.](https://towncenterdental.multisites.ai/guides/childs-first-dental-visit) - [Cavities explained: causes, decay without pain and treatmentYes, you can have a cavity without pain. NIDCR says early tooth decay usually has no symptoms, so dentists find it at checkups and on X-rays. Very early enamel damage can sometimes be stopped with fluoride. Once a hole forms, the usual treatment is a filling.](https://towncenterdental.multisites.ai/guides/cavities-explained) - [Cavities in Toddlers: Causes, Signs and PreventionYes, toddlers can get cavities. Decay can start as soon as a baby has teeth. Common causes are frequent sugary drinks, bottles in bed, and germs passed from caregiver to child. Early signs are white, brown or black spots. Daily brushing with fluoride toothpaste, a cup by age one and dental visits help.](https://towncenterdental.multisites.ai/blog/cavities-in-toddlers) - [Private Well in Wildwood? Fluoride Facts for KidsWildwood homes on private wells do not get a fluoride report from a water utility. CDC says only a lab test can show the fluoride level in well water. Take the result to your child's dentist, who can talk with you about fluoride toothpaste and other options.](https://towncenterdental.multisites.ai/blog/on-a-private-well-in-wildwood-what-to-know-about-fluoride-for-kids) - [Missouri Towns Ending Fluoridation: Kids' Teeth FactsMissouri leaves fluoridation to local governments, and a few towns, including Branson and Houston, have stopped adding it. If your town changes, ask your water supplier for its fluoride level and talk with your child's dentist about fluoride toothpaste and other options.](https://towncenterdental.multisites.ai/blog/some-missouri-towns-are-ending-fluoridation-what-it-means-for-kids-teeth) - [Dental X-Rays: How Much Radiation, Which Types and How OftenDental X-rays use very low doses of radiation, and the ADA says the risk of harm is very small. Dentists order them based on your age, risk for disease and symptoms, so you may not need them at every visit. Bitewing, periapical and panoramic images are the most common types.](https://towncenterdental.multisites.ai/guides/dental-xrays-safety-frequency) ## Ready when you are [Request an appointment](https://towncenterdental.multisites.ai/request-appointment)[Call (636) 273-5866](tel:+1-636-273-5866)