Dental Sealants and Fluoride for Kids: What They Do and When to Get Them

Parents are often surprised to hear that most childhood cavities start in the back teeth, in the deep grooves a toothbrush simply cannot reach, even in kids who brush well. Two quick, painless treatments make a real difference there: dental sealants and fluoride varnish. Neither involves a needle or a drill, which matters a lot when the patient is six.

What Are Dental Sealants?

The chewing surfaces of the back teeth have deep grooves where food and bacteria collect and a toothbrush cannot fully reach. A sealant is a thin protective coating painted into those grooves. It hardens and forms a smooth surface that is easier to keep clean.

According to the U.S. Centers for Disease Control and Prevention (CDC), sealants prevent about 80% of cavities in the back teeth for two years after they are placed, and keep protecting for several years after that.

When Should Kids Get Sealants?

Sealants are usually placed on the permanent molars soon after they come in, which is commonly around age 6 for the first molars and around age 12 for the second molars. Some children also benefit from sealants on baby molars or other teeth with deep grooves. Your child's dentist will tell you which teeth to seal.

What Happens During the Visit

1. The teeth are cleaned and dried.
2. The grooves are prepared so the sealant bonds well.
3. The sealant is painted on and hardened, often with a small light.

There is no drilling and no numbing, and each tooth takes only a few minutes. Sealants are checked at regular visits and touched up if they wear.

What Is Fluoride Varnish?

Fluoride strengthens enamel and helps reverse very early decay. Fluoride varnish is a sticky coating painted onto the teeth at a dental visit. It sets quickly, and children can usually eat and drink soon afterwards, following the instructions given at the visit.

Varnish adds to, but does not replace, daily brushing with a fluoride toothpaste. Use a smear the size of a grain of rice for children under 3, and a pea-sized amount for ages 3 to 6, and help young children brush.

Sealants vs. Fluoride: Do Kids Need Both?

They protect in different ways. Sealants block the grooves on chewing surfaces, while fluoride strengthens all tooth surfaces, including the sides and between the teeth. Many children benefit from both, depending on their risk of cavities.

Other Habits That Prevent Cavities

• Brush twice a day and start flossing when teeth touch.
• Limit sugary drinks and frequent snacking.
• Do not put a baby to bed with a bottle of milk or juice.
• Keep regular checkups, starting by the first birthday.

Book Your Child's Checkup

Our kids dentistry visits include cleanings, sealants, and fluoride, and we go at the child's pace, especially on the first visit. Many families book a parent's checkup on the same trip. Call (310) 731-6119 or request a visit online.