Sealants & Fluoride · San Ramon
The two cheapest things that prevent the most
Unglamorous, quick, and pound for pound the best return on anything we do.
Who this is for
- Children with newly erupted permanent molars — around six, and again around twelve
- Anyone with deep grooves in their back teeth
- A history of cavities despite reasonable brushing
- Dry mouth from medication, which sharply raises decay risk
Why sealants work so well
The chewing surface of a molar is not flat — it is a landscape of grooves, and some of those grooves are narrower than a single toothbrush bristle. Bacteria and food get in; the bristle does not. That is where the large majority of childhood cavities begin, and no amount of diligent brushing changes the geometry.
A sealant is a thin resin flowed into those grooves and set with a light. It turns a surface a brush cannot clean into one it can. No drilling, no anesthetic, no discomfort, and about ten minutes for a couple of teeth.
For a child's permanent molars this is the single highest-value preventive thing available. It is also frequently the difference between a mouth that needs almost nothing done to it and one that needs fillings through the teens.
What fluoride actually does
Enamel is constantly losing and regaining mineral. Acid from bacteria pulls mineral out; saliva puts it back. A cavity forms when that balance tips the wrong way for long enough.
Fluoride shifts the balance back. It helps the enamel remineralize and forms a slightly more acid-resistant surface, which is why it also settles sensitivity for a lot of people.
Varnish applied at a visit is painted on in about a minute, sets on contact, and stays working for hours. It is the most concentrated form and the one worth having professionally.
Who benefits as an adult
Sealants are mostly for children, but adults with deep unrestored grooves genuinely benefit and we will point that out if we see it.
Fluoride varnish is worth more to adults than most people realize — particularly anyone with dry mouth from medication, exposed root surfaces after gum recession, a history of frequent cavities, or orthodontic appliances that are hard to clean around.
Root surfaces are considerably softer than enamel, which is why decay in older adults so often appears at the gumline. Varnish is the cheapest defense there is.
What to expect
Here’s how the visit actually goes.
No surprises. That’s the whole idea.
01
Cleaning first
The tooth is cleaned and dried. That is the whole preparation for a sealant.
02
Placing the sealant
Resin flowed into the grooves and set with a light. Ten minutes for a couple of teeth, no injection, nothing to feel.
03
Fluoride varnish
Painted on in about a minute at the end of the appointment. It tastes faintly of the flavor your child picks.
04
Afterwards
Nothing hard or sticky for the rest of the day, and leave the varnish on until the next morning before brushing.
05
Checked every visit
Sealants can chip. We look at them at every check-up and top them up — usually at no charge.
Questions
Answered before you ask.
Is fluoride safe?
At the doses used in dentistry, yes — this is among the most studied areas in the field. The genuine risk is fluorosis from young children swallowing large amounts of toothpaste over years, which is why we recommend a smear rather than a strip for under-threes and supervision until they can reliably spit.
How long do sealants last?
Several years, often longer. They can chip or wear at the edges, which is why we check them at every visit and repair rather than replace.
Can a sealant trap decay underneath?
This is a reasonable worry and the answer is that we do not seal a tooth we believe is already decayed — we check first. A sealed groove is also deprived of the sugar that decay needs to progress.
At what age should my child get sealants?
Shortly after the first permanent molars come through, around six, and again for the second molars around twelve. Getting them soon after eruption, before decay starts, is the whole point.
In their words
Thirty years of families who stayed.
Every quote below is a patient's own, unedited, from our reviews.
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