Sensitive Teeth: Why Do My Teeth React to Cold and Sweets, and What Helps?

Why are my teeth sensitive to cold, heat and sweets?

Your teeth react because the layer under the enamel is exposed. The ADA explains that a layer of enamel protects the crown of each tooth, and a layer called cementum protects the root. Underneath both is dentin, which is less dense and has microscopic tubes in it.

When dentin loses its covering, those tubes let heat, cold, and acidic or sticky foods reach the nerves and cells inside the tooth. The result is called hypersensitivity. Cleveland Clinic describes the same thing: the outer enamel wears down, and the softer dentin underneath is more sensitive. It can make it painful to eat or drink something hot, cold, sweet or sour.

Dentin can be exposed in two main ways: the enamel wears thin, or the gum pulls back from the root. Tooth sensitivity is a symptom, not a disease. Your dentist looks for the reason behind it.

What causes sensitive teeth?

The ADA and Cleveland Clinic list many causes. Some are habits, some are dental problems, and some are products. The table sorts them.

Cleveland Clinic says sensitivity can be a sign of a bigger problem, like a cavity, gum disease or a cracked tooth. This is why you should not assume it is only a toothpaste issue.

When is sensitivity a sign of something more serious?

Sensitivity that is sharp, or that does not go away, may point to a problem. Cleveland Clinic says mild pain often gets better with desensitizing toothpaste and good dental care. But if the pain is sharp or does not go away, it could be a sign of a more serious issue.

Watch for these signs:

• Pain that lingers after the cold or heat is gone
• Pain when you bite down
• Pain on one tooth only
• Swelling in the gum, or a bump on the gum
• A visible crack, chip or dark spot

If you see swelling, have a fever, or have trouble breathing or swallowing, use an emergency room. Our toothache guide lists the warning signs.

How do you tell sensitivity from a cavity or a crack?

You cannot tell for sure at home. Cleveland Clinic says sensitivity can be a sign of a cavity, gum disease or a cracked tooth, and the ADA lists tooth decay and fractured teeth among the possible causes. A dentist uses an exam and X-rays to sort them out.

Clues can help you describe the problem. Use the table to note what you notice, then share it with the team.

A short log for a week can help. Write down the date, what set it off, and how long it lasted. Bring the log to your visit.

Which foods and habits make teeth more sensitive?

Acid and hard brushing are two common triggers. Cleveland Clinic says citrus fruits, tomatoes, pickles and tea can wear down the outer layer of your teeth. It also says using too much pressure or a hard toothbrush can wear down enamel and make gums pull back.

Some mouthwashes have acids that can make sensitivity worse, and some whitening products can raise it. If a product seems to trigger pain, stop using it and tell your dentist.

You do not have to give up your favorite foods. Sip acidic drinks quickly instead of over hours, rinse with plain water afterward, and use a soft toothbrush with light pressure. Your dentist can talk with you about changes that fit your habits.

What does a dental visit for sensitivity involve?

The visit starts with your story. The dentist asks which teeth react, to what, and for how long. Then comes an exam of the teeth and gums. X-rays may be taken to look for decay or other problems under the surface.

The dentist then explains what was found and what the choices are. The ADA says the type of treatment depends on the cause. A small change, such as a desensitizing toothpaste, may be the first step. A deeper problem, such as a cavity or a crack, calls for treatment of that problem.

Ask for a plan and a time to check back. Some options, such as the toothpaste, take several uses to show a change, per the ADA.

Ignoring it can let a small problem grow. Cleveland Clinic says that if sensitive teeth go untreated, you could end up with an infected tooth, cavities, gum disease, or long-term or worsening pain.

That does not mean every sensitive tooth is in trouble. Cleveland Clinic also says sensitivity can go away on its own, especially after a dental visit. But it says not to ignore the pain, and that getting care early can help prevent more serious problems.

How can a dentist treat sensitive teeth?

Treatment depends on the cause. The ADA says sensitive teeth can be treated, and the type of treatment depends on what is causing the sensitivity. Here are the options the ADA and Cleveland Clinic list.

Your dentist will talk with you about what fits your teeth, and what to expect. A gum graft or a root canal is not common for simple sensitivity. The ADA lists them for cases where gum tissue is lost or sensitivity is severe and persistent and cannot be treated by other means.

What can you do at home?

Daily care matters most. The ADA says proper oral hygiene is the key to preventing sensitive-tooth pain. Cleveland Clinic suggests a few steps.

1. Try desensitizing toothpaste. Use it every day. The ADA says it usually requires several applications before the sensitivity is reduced. Cleveland Clinic says you can dab a little on the sore spot before bed.
2. Use a soft-bristled toothbrush. A hard brush and heavy pressure can wear down enamel and make gums pull back.
3. Go easy on acid. Citrus fruits, tomatoes, pickles and tea can wear down the outer layer of your teeth.
4. Check your mouthwash. Some have acids that make sensitivity worse. Ask your dentist for a gentler formula.
5. Keep up with cleanings and check-ups. Cleveland Clinic lists regular visits as a way to head off sensitivity.
6. Tell your dentist if you grind your teeth. Grinding wears down enamel and can expose dentin. A night guard may help. See our guide on teeth grinding.

Home care does not replace an exam. If the sensitivity does not ease in a few weeks, or if it gets worse, call your dentist.

Why are my teeth sensitive after a filling, crown or cleaning?

Short-term sensitivity after dental work is common. Cleveland Clinic lists recent dental procedures such as fillings and cleanings as a cause of short-term sensitivity. Teeth have just been worked on, and the nerves may be irritated for a time.

Call the office if sensitivity is sharp, gets worse over time, or makes it hard to bite. The dentist can check the bite and the tooth. The practice’s dental fillings page explains how the practice describes fillings.

Does teeth whitening cause sensitivity?

It can. Cleveland Clinic says some teeth whitening products can increase sensitivity, and suggests asking your dentist about other options. If your teeth are already sensitive, mention it before you start whitening. Read our teeth whitening guide for the full picture of what to ask.

Do sensitive teeth and receding gums go together?

Often, yes. When gums pull back, the root surface shows. The ADA says dentin may be exposed when gums recede, and Cleveland Clinic says thin or damaged gums may pull back and reveal the sensitive root surface. Cleveland Clinic also says swollen or infected gums from gum disease can expose tooth roots.

If you notice a tooth that looks longer than before, or a notch near the gum line, tell your dentist. The practice describes how it cares for gums on its periodontal care page. Our guide on receding gums explains causes and options.

What should you avoid doing?

A few common reactions can make things worse. Do not brush harder to clean a sore spot, because heavy pressure can wear enamel and push gums back. Do not avoid brushing the area either, since plaque near the roots can trigger pain. Do not keep switching products every few days. Desensitizing toothpaste usually needs several uses before it helps, per the ADA, so give one product a fair try.

Finally, do not treat lasting or sharp pain on your own for months. Cleveland Clinic says not to ignore the pain. An exam can tell you whether the cause is simple or not.

What should you ask your dentist?

Questions help you leave with a clear plan.

• Why are my teeth sensitive? Is it one tooth or many?
• Do I have a cavity, a crack or receding gums?
• What toothpaste or in-office treatment do you suggest?
• Should I change how I brush?
• Do I grind my teeth? Would a night guard help?
• When should I come back if it does not improve?

Next step

Sensitive teeth deserve an exam, not guesswork. Read about the practice’s periodontal care and then call (636) 273-5866 or request an appointment. Tell the team which foods or drinks set off the pain and how long it lasts.