What Are Dental Sealants?
Dental sealants are a thin plastic-like coating, usually made of resin material, that bonds to the chewing surface of back teeth. The chewing surfaces of molars and premolars have deep pits and grooves (called fissures) where food particles and bacteria collect easily. Even thorough brushing often cannot reach the bottom of these narrow grooves.
A dental sealant fills in these grooves and creates a smooth, protective barrier over the tooth surface. Bacteria and food cannot penetrate the sealed surface, which prevents the decay process from starting in those vulnerable areas. Sealants protect the areas of the tooth that are most prone to cavities.
How Dental Sealants Prevent Cavities
Cavities form when bacteria in the mouth produce acid that breaks down tooth enamel. The deep grooves on the chewing surfaces of molars are especially vulnerable because they trap food and bacteria in spaces that a toothbrush bristle cannot reach. Over time, acid produced by trapped bacteria eats through the enamel and creates a cavity.
Sealants work by physically blocking bacteria and food from settling into these grooves. The sealant material flows into the pits and fissures when applied and hardens to create a smooth barrier. With the grooves sealed, the tooth surface is easier to clean and far less likely to develop decay.
When Should Children Get Dental Sealants?
The best time to apply dental sealants is shortly after the permanent molars come in, before cavities have a chance to develop. Children typically get two sets of permanent molars.
First Permanent Molars (Around Age 6)
The first permanent molars, often called "6-year molars," erupt behind the baby teeth around age 5 to 7. These teeth come in without replacing a baby tooth, so parents sometimes do not notice them. Applying sealants as soon as these molars are fully erupted protects them during the cavity-prone early years when children are still developing good brushing habits.
Second Permanent Molars (Around Age 12)
The second permanent molars, sometimes called "12-year molars," erupt around ages 11 to 14. These teeth also have deep grooves that benefit from sealants. Applying sealants when they first come in provides protection through the teenage years, when cavity rates tend to be higher.
Premolars and Baby Teeth
Premolars (the teeth between canines and molars) can also receive sealants if they have deep grooves. In some cases, a pediatric dentist may recommend sealants on baby molars for children who are at high risk for cavities. This is less common but can be a useful preventive measure for cavity-prone children.
What Happens During the Sealant Procedure
Applying dental sealants is one of the simplest procedures in dentistry. It requires no drilling, no injections, and no anesthesia. Most children find it completely comfortable.
The process takes about five minutes per tooth and follows these steps. First, the dental hygienist or dentist cleans the tooth thoroughly and dries it. An acidic solution (called an etchant) is applied to the chewing surface for a few seconds. This roughens the enamel slightly so the sealant material will bond securely to the tooth. The tooth is rinsed and dried again.
Next, the liquid sealant material is painted directly onto the grooves of the tooth. The material flows into the pits and fissures. A special curing light is used to harden the sealant in about 20 to 30 seconds. Once hardened, the sealant becomes a clear or slightly tinted protective shield over the tooth surface.
Your child can eat and drink normally immediately after the appointment. There is no recovery period or post-procedure sensitivity.
How Long Do Dental Sealants Last?
Dental sealants typically last 5 to 10 years with normal chewing and wear. Some sealants last even longer. The dentist or hygienist checks the condition of your child's sealants at every routine checkup.
Sealants can chip, wear down, or partially come off over time, especially if your child chews ice, hard candy, or other hard foods. If a sealant is damaged or worn, the dentist can reapply sealant material to the tooth quickly and easily. The reapplication process is the same as the original application.
Even if a sealant eventually wears away completely, the tooth received protection during the highest-risk years for cavity development. Teeth that had sealants applied early still show lower cavity rates years later compared to teeth that were never sealed.
Are Dental Sealants Safe?
Yes. Dental sealants have been used for over 50 years and are endorsed by the American Dental Association (ADA), the American Academy of Pediatric Dentistry (AAPD), and the Centers for Disease Control and Prevention (CDC) as a safe and effective cavity prevention method.
Some parents have asked about BPA (bisphenol A) in sealant materials. While some resin-based sealants contain trace amounts of BPA or BPA derivatives, the exposure is extremely small. According to the ADA, the amount of BPA exposure from dental sealants is significantly lower than what people encounter through food, beverages, and other everyday sources. The health benefits of preventing cavities far outweigh any concerns about trace BPA exposure.
Dental sealants do not damage tooth enamel. The etching solution used during application creates a microscopic roughness that allows the sealant to bond, but this does not weaken the tooth. If the sealant is removed or wears away, the enamel underneath is intact.
Dental Sealant Cost and Insurance Coverage
Dental sealants typically cost between $30 and $60 per tooth. Since most children get sealants on four to eight teeth (the permanent molars and sometimes premolars), the total cost generally ranges from $120 to $480.
Most dental insurance plans cover sealants for children, typically up to age 14 or 16. Medicaid and CHIP programs cover dental sealants for eligible children in most states. Some school-based dental programs offer sealants at no cost.
Compared to the cost of treating a cavity (which can range from $150 to $400 or more for a filling), sealants are a cost-effective preventive investment. Costs vary by location, provider, and the number of teeth treated.
Dental Sealants vs Fluoride: Do You Need Both?
Sealants and fluoride protect teeth in different ways, and they work best when used together. Fluoride strengthens tooth enamel and makes it more resistant to acid attacks from bacteria. It protects all surfaces of every tooth. Sealants provide a physical barrier on the chewing surfaces of back teeth, which are the areas most vulnerable to decay.
Think of fluoride as strengthening the armor on every tooth, while sealants add an extra shield to the teeth that need it most. The CDC, ADA, and AAPD all recommend using both fluoride and sealants as part of a preventive dental care plan for children. They are complementary treatments, not alternatives to each other.
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