Quick answers
- When should my child get them?
- As soon as each permanent molar has fully erupted — around age 6 for first molars and around age 12 for second molars.
- How well do they work?
- The ADA reports sealants cut decay risk in molars by close to 80%.
- Do they replace fluoride?
- No. They protect different surfaces and are used together.
- Is the BPA concern real?
- Trace amounts exist, but exposure is smaller than from handling a paper receipt. The ADA finds no health concern at these levels.
- Do they hurt?
- No drilling and no numbing. The tooth is cleaned, prepared, painted, and set with a light.
- Are they permanent?
- No. They wear and chip, and are checked and repaired at routine visits.
When should a child get dental sealants?
The window opens when a molar breaks fully through the gum and starts closing as soon as bacteria settle into its grooves. A newly erupted molar has deep, sharp fissures and enamel that has not yet fully hardened, which is exactly when it is most vulnerable and most worth sealing.
Eruption timing and when each tooth is best sealed
| Tooth |
Usually erupts |
Best time to seal |
| First permanent molars, often called six-year molars |
Around age 6 to 7 |
Soon after the chewing surface is fully clear of gum tissue |
| Premolars |
Around age 10 to 12 |
Sealed when grooves are deep enough to warrant it |
| Second permanent molars, often called twelve-year molars |
Around age 11 to 13 |
Soon after eruption, before the teen years of independent brushing |
| Primary molars |
Age 2 to 3 |
Considered for children at higher decay risk |
Two practical points follow from this. First, sealants are not a single appointment but a sequence spread across roughly six years of childhood, which is why they come up repeatedly at check-ups. Second, a molar that erupts and goes unsealed for two or three years often no longer qualifies, because decay has already started in the grooves.
Six-year molars are the ones most often missed. They arrive behind the baby teeth without any tooth falling out first, so parents frequently do not realize a permanent tooth has appeared.
Seal it, watch it, or fill it?
A groove that looks dark is not automatically a cavity, and the right response depends on whether decay has actually broken through the enamel.
How the condition of a groove determines treatment
| What we find |
What it usually means |
What we do |
| Deep groove, sound enamel |
High risk, no damage yet |
Seal it |
| Staining without softening |
Often pigment, not decay |
Seal it and monitor |
| Very early demineralization |
Enamel affected, surface intact |
Seal it; evidence supports sealing early non-cavitated lesions |
| Shallow, self-cleaning grooves |
Low risk |
Watch it, no sealant needed |
| Decay through the enamel |
An actual cavity |
Fill it, since a sealant will not stop it |
The middle rows are where judgment matters. Sealing a groove with very early, non-cavitated demineralization is supported by current evidence and can arrest the process, which is a better outcome than drilling. Sealing over a genuine cavity is not. Distinguishing the two is what the exam is for, and it sometimes requires digital dental X-rays.
Which surfaces sealants protect, and which they do not
Sealants cover pits and fissures only. They do nothing for the surfaces between teeth or along the gumline. This is the most useful thing to understand about them, and the reason they are one part of prevention rather than the whole of it.
Tooth surfaces and what protects each one
| Surface |
Protected by a sealant? |
What protects it instead |
| Chewing surface grooves of back teeth |
Yes, this is their entire purpose |
Sealant plus brushing |
| Between the teeth |
No |
Flossing, and fluoride |
| Along the gumline |
No |
Brushing technique, professional cleaning |
| Smooth outer and inner surfaces |
No |
Brushing, and fluoride |
| Pits on the cheek side of lower molars |
Sometimes, when a groove is present |
Sealant where indicated, otherwise brushing |
Because the grooves account for a large share of childhood decay, sealing them removes a disproportionate amount of risk for a small intervention. It does not remove the need for dental cleanings, flossing, or routine dental exams.
Dental sealants vs fluoride
Fluoride hardens enamel chemically across the whole tooth. A sealant physically blocks a groove that a toothbrush bristle is too wide to enter. They are not alternatives, and the evidence favors having both.
How sealants and fluoride differ
|
Dental sealants |
Fluoride |
| How it works |
Physical barrier over a groove |
Chemical strengthening of enamel |
| Where it works |
Chewing surface pits and fissures only |
Every surface it reaches |
| Applied by |
A dental professional |
Toothpaste, water, rinses, in-office varnish |
| How often |
Once per tooth, then checked and repaired |
Daily at home, periodically in office |
| Reverses early decay? |
Can arrest it under the seal |
Can remineralize early lesions |
| Lasts |
Years, with wear |
Hours to months per application |
Reviewing three studies covering close to 2,000 participants, the ADA reports that patients who received pit-and-fissure sealants on chewing surfaces saw roughly a 73% greater reduction in new decay than patients who received fluoride varnish alone. Fluoride remains important for the surfaces a sealant cannot reach. Our article on the fluoride water debate covers community fluoridation separately.
Are dental sealants worth it?
By the usual measures of preventive dentistry, yes — sealants are among the better-evidenced and least expensive interventions available. The findings most often cited:
- The ADA reports sealants reduce decay risk in molars by close to 80%.
- CDC findings indicate school-age children without sealants develop roughly three times as many cavities as children who have them.
- CDC has reported that approximately one cavity is prevented for every four sealants placed.
- The Community Preventive Services Task Force recommends school-based sealant programs on the strength of this evidence.
- Protection is strongest in the first years after placement and declines as sealants wear, which is why they are checked rather than assumed.
Despite this, the ADA notes that only around 43% of children aged 6 to 11 have sealants. The gap is mostly a matter of timing and awareness rather than any dispute about whether they work. A sealant also costs a small fraction of the filling it is meant to prevent, which is why it holds up as prevention even when a given tooth might never have decayed.
Are dental sealants safe? The BPA question
This is the question parents ask most, and it deserves a direct answer rather than reassurance.
Bisphenol A is not used as an ingredient in dental sealant formulas. Trace amounts can appear either as a byproduct of the material breaking down or as a manufacturing contaminant. A small amount may be detectable in saliva for a few hours after placement, and then it is gone.
The ADA’s position, based on current evidence, is that there is no health concern from BPA exposure from dental materials. For scale, the ADA points out that a person encounters more BPA from handling a paper receipt, using cosmetics, or ordinary household dust than from sealants. The ADA and the American Academy of Pediatric Dentistry have both reviewed the evidence and continue to recommend sealants for children.
If you would still prefer to avoid resin-based material, glass ionomer sealants are an alternative. They release fluoride and contain no BPA-related compounds, though they generally do not stay on the tooth as long as resin sealants do. We are happy to discuss which suits your child.
Why sealants fail, and what happens then
The most common cause of early sealant failure is moisture reaching the tooth during placement. Saliva contaminating the surface at the wrong moment prevents the material from bonding properly, and the sealant comes off within months rather than years.
This is why the isolation step matters more than it appears to. Keeping a six-year-old’s back molar completely dry for a couple of minutes is the genuinely skilled part of the procedure, and it is the difference between a sealant that lasts and one that does not.
Other reasons sealants fail:
- Partial loss. A section chips away and leaves a ledge that traps more plaque than an unsealed groove would.
- Wear. Chewing gradually thins the material on heavily used surfaces.
- A tooth that was not a good candidate. Shallow grooves hold sealant poorly.
- Sealing over undetected decay. Active decay needs treating first.
Partial loss is the reason sealants are checked at every routine visit. A partly missing sealant is worse than none at all, and repairing it takes minutes.
Do adults benefit from sealants?
Sometimes, though the case is narrower than for children. An adult molar with deep grooves, no decay, and no existing filling can be sealed, and it may be worth doing for someone with a history of decay, dry mouth, or difficulty cleaning back teeth thoroughly.
Most adult molars, however, already have fillings or restorations in the grooves, which leaves nothing to seal. Adult coverage is also less commonly included in dental plans than coverage for children.
What sealants cost and how insurance handles them
Sealants are priced per tooth and are among the least expensive procedures in dentistry, which is much of their appeal as prevention.
Dental plans commonly cover sealants for children at a high percentage, sometimes fully, but usually with conditions. The most frequent restrictions are an age cut-off, coverage limited to permanent molars, and a limit on how often the same tooth can be re-sealed. These vary considerably between plans, so we verify your specific benefits before treatment rather than generalizing. Patients without insurance can use our membership plan or flexible payment options.
What happens at the appointment
Sealants involve no drilling, no numbing, and no removal of tooth structure. The tooth is cleaned and dried, a preparing solution is applied to the enamel for a few seconds and rinsed, the surface is dried again and kept dry, the sealant is painted into the grooves, and a curing light sets it in seconds. The bite is checked before you leave.
A single tooth takes a few minutes. Most children have sealants placed at the same visit as a cleaning, and eat normally straight afterward.
Dental sealants at Vaksman Dental Group
Vaksman Dental Group is a general and family dental practice at 1241 Mission Road in South San Francisco, CA 94080, led by Dr. Irena Vaksman, DDS. We are near El Camino Real and the South San Francisco BART station, and see families from San Bruno, Daly City, Brisbane, Colma, Pacifica, Millbrae, and Burlingame.
How we handle sealants:
- We track molar eruption at each check-up so the timing window is not missed
- We seal when the tooth is ready rather than on a fixed schedule
- Existing sealants are checked and repaired at routine visits, including ones placed elsewhere
- We will tell you when a tooth does not need sealing
- Sealants sit within a broader preventive dentistry plan rather than standing alone
Schedule a preventive visit in South San Francisco
If your child has a new permanent molar coming in, that is the moment worth catching. A short exam will tell you which teeth are ready to seal and which should wait.
Book online or call Vaksman Dental Group at (650) 588-3710. We are at 1241 Mission Road, South San Francisco, CA 94080, open Monday through Friday, 8:00 AM to 5:00 PM.
Medical review and sources
This page was written and reviewed by Dr. Irena Vaksman, DDS, and is reviewed at least every 12 months against current clinical standards. Clinical information and statistics reflect the following sources:
This page is general information, not a treatment recommendation. Only an in-person examination can determine whether sealants are appropriate for a particular tooth.
