About Cavities (Tooth Decay)

Overview

Cavities (also called tooth decay or dental caries) are one of the most common diseases people get and live with during their lifetime.1 Cavities are caused by the bacteria in your mouth that stick to your teeth. You feed the bacteria every time you eat or drink.

The bacteria produce acid which starts to dissolve the outer enamel layer of your teeth. Your saliva clears away the acid and helps to repair the enamel. If the repair isn't fast enough, bacteria get inside your tooth and make cavities. Cavities will get bigger unless the bacteria are stopped or removed.

Symptoms

Cavities cause pain and sensitivity as they get bigger, especially when close to the nerve in the middle of your tooth. If the cavity reaches your nerve it may cause an infection (abscess) that can spread in your body. It is rare, but this can cause death.

You should not experience pain in your mouth or teeth. In children, cavities may lead to problems with eating, speaking, playing, and learning. For people of all ages, cavities that are not stopped lead to tooth loss.

Risk factors

Chances of getting cavities are higher if you:

• Drink or eat things with acid or sugar, especially between meals.
• Take medicine or have problems that lessen how well your saliva protects your teeth.
• Wear braces or other oral appliances.
• Can see your tooth roots.
• Struggle to brush because of vision, cognitive, or physical problems.

Who is at risk

Children

• Half of children (50%) aged 6 to 9 years have had at least one cavity in their primary (baby) or permanent teeth.2

• 1 in 10 adolescents (10%) aged 12 to 19 years have at least one untreated cavity.2

• Children aged 5 to 19 years from low-income families are twice as likely (25%) to have cavities, compared with children from higher-income households (11%).3

Adults

• 1 in 5 adults (21%) aged 20 to 64 years have at least one untreated cavity.2

• Adults who are male, non-Hispanic Black, low income, have a high school education or less, and currently smoke experienced more untreated cavities compared to their respective reference groups.2

Older Adults

• Nearly all adults (96%) aged 65 years or older have had a cavity.4
• 1 in 6 adults aged 65 years or older have untreated cavities.4

Prevention

The good news is that cavities can be prevented. The best evidence shows:

• Fluoride varnish reduces cavities in primary (baby) teeth by one-third.5
• Children who drink fluoridated tap water have fewer cavities.6
• Children who brush daily with fluoride toothpaste have fewer cavities.7
• Dental sealants on the back teeth prevent 80% of cavities.8

Treatment and recovery

You should visit your dentist every year, especially to find any cavities. Your dentist may recommend fluoride or other products to stop small cavities. You may need a filling to fix larger cavities. A tooth with a cavity near the nerve may need a root canal or to be pulled.

Myths and misconceptions

Myth: Baby teeth come out anyway so it doesn't matter if they have cavities.
Fact: Cavities in children can cause pain and may lead to problems with eating, speaking, playing, and learning. Infection from cavities can also hurt adult teeth growing underneath.

Myth: My tooth quit hurting so I don't need to see the dentist.
Fact: Waiting limits the options dentists have to fix large cavities. Cavities grow and, unless stopped, lead to tooth loss. Missing teeth can affect nutrition and lower your quality of life.9

Myth: I'm going to lose my teeth anyway, I should pull my teeth and get dentures.
Fact: More than 4 in 5 adults keep their teeth until they die.4 Missing teeth can make it harder to eat meats, fruits, and vegetables which can lower quality of life.