Dental Sealants for Kids: What They Are and When They Help

Parents ask me about sealants more than almost anything else during a child's checkup, usually within a few seconds of me saying the word. It sounds like a procedure. It really isn't. A sealant is one of the simplest things we do, and for the right tooth at the right age it can head off a fair amount of drilling later on. Here is what they are and how I think about recommending them.

What a sealant actually is

A dental sealant is a thin coating painted onto the chewing surface of a back tooth. It flows down into the grooves, we harden it with a light, and it stays put. That is the whole thing. No drilling, no numbing, no shot. Most kids are a little surprised when it's over.

The material is usually a resin, similar to what we use for white fillings. Some sealants are made from glass ionomer instead. Either way the goal is the same: fill in the deep grooves so food and bacteria can't settle into them.

Why back teeth are the problem

If you look closely at a molar, the chewing surface isn't smooth. It has a pattern of pits and grooves, and on some teeth those grooves are deep and narrow, in places narrower than a single toothbrush bristle. A child can brush carefully and still not get down into them.

That's why cavities in kids so often turn up on the back teeth rather than the front ones. It usually isn't a brushing problem. It's a shape problem. A sealant changes the shape.

When I recommend them

The timing follows the teeth, not the birthday:

• The first permanent molars come in around age six

• The second permanent molars come in around age twelve

• Sealing within a year or two of a molar coming in is usually when it makes the most sense

Past timing, I look at the tooth itself and at the child's history. Deep grooves, a couple of cavities already, or a real struggle to keep the back teeth clean all push me toward sealing. Shallow grooves and no cavity history make it less urgent. Some baby molars are worth sealing too, if the grooves are deep and the child tends to get cavities. Adults can have sealants as well. It's less common, but a deep groove is a deep groove.

What the appointment is like

Short. The sequence runs about like this:

• We clean the tooth and dry it

• A conditioning gel goes on the chewing surface briefly, then gets rinsed off and dried again

• We flow the sealant into the grooves

• A curing light sets it in a few seconds

• We check the bite and smooth it down if it feels high

Your child sits with their mouth open, and that is about the extent of what's asked of them. Nothing to recover from, and they can eat right afterward.

How long they last

Sealants wear down. Chewing is hard on them, and over the years they chip or thin at the edges, especially on a tooth that takes a lot of force. That's expected rather than a failure.

It's also why I check them at every cleaning. If one has worn through in a spot, we can usually add material back without starting over. A sealant that has quietly broken down is the one that stops helping, so the checkups matter at least as much as the original placement.

What a sealant is not

A few honest limits:

• It only protects the surface it covers. Cavities between teeth are a flossing matter, and no sealant reaches there.

• It's not a substitute for brushing twice a day with fluoride toothpaste.

• It doesn't undo constant sipping and snacking. Juice or soda nursed through a whole afternoon will outpace any sealant.

• It can't fix a cavity that's already there.

That last point matters. If there's already decay down in the groove, sealing over it is the wrong move, and we treat the cavity instead. Occasionally decay is early and shallow enough that a small filling plus a sealant over the rest of the surface is reasonable, but that's a judgment call I'd want to make with an exam and an X-ray in front of me.

If you're weighing it

Two questions cover most of the decision: when did your child's molars come in, and are the grooves deep? And if your child has had cavities before, mention it. It changes what I'd suggest.

Sealants aren't dramatic. They just keep a vulnerable surface from turning into a problem during the years it's most vulnerable, and that's worth a few quiet minutes in the chair.

This post is general information rather than a diagnosis. Whether a particular tooth should be sealed depends on an exam.

Hashimi Dental, 3701 Market St. Suite E, Riverside, CA 92501