Dental (Fissure) Sealants: Protecting the Grooves of Back Teeth

Dental (fissure) sealants are a thin protective coating painted onto the chewing surfaces of back teeth, sealing the deep grooves where a toothbrush struggles to reach. No drilling is involved: a sealant sits on top of tooth structure that is otherwise healthy, rather than repairing a cavity that has already formed.

Sealants are most often placed on children's newly erupted permanent molars, though an adult with deep, decay-free grooves and a higher risk of cavities may also benefit. At Er Dental Clinic in Istanbul, Turkey, sealants are usually considered alongside a check-up and a professional cleaning, as part of a wider preventive plan.

This page covers who sealants suit, how they are applied, and when a filling is the more appropriate choice instead, for example once a cavity has already formed in the tooth.

Type: a thin resin coating painted onto the deep grooves (fissures) of back teeth, usually molars and premolars.

What it does: seals grooves that trap plaque and food, reducing the chance of decay starting there.

No drilling: healthy tooth structure is not removed to place a sealant.

Common after-effects: none typical; sealants are checked, and topped up if needed, at your routine check-ups.

Sealants are considered mainly as a way to prevent tooth decay, before a cavity has had the chance to form in the deep grooves of a back tooth. Newly erupted permanent molars are a common example, since their grooves can be too narrow for bristles to clean fully in the first months after they come through. An adult who has never had decay in a particular tooth but has unusually deep, hard-to-clean grooves, or a generally higher risk of cavities, may also be considered for a sealant at a routine check-up.

Sealants tend to suit a tooth that is free of decay but has deep, narrow grooves that are difficult to keep clean with a toothbrush alone. This includes many children's first and second permanent molars soon after they erupt, as well as adults with a higher risk of cavities, for example because of a dry mouth, a diet high in sugary or acidic foods and drinks, or a history of decay in other teeth.

Your dentist checks that the grooves are genuinely free of decay, and that the tooth can be kept dry during the short appointment, before recommending a sealant.

Before you travel. The process usually starts with a free online consultation, alongside whichever main treatment brings you to Istanbul. You send recent photos and, if relevant, X-rays, so our dentists can give an initial view.

At the clinic. A check-up looks at the grooves of your back teeth to confirm they are free of decay, and a professional cleaning is often carried out shortly beforehand so the tooth surface is free of plaque before the sealant is applied.

If a sealant is not the right fit. Where a groove already has decay, your dentist explains why a filling or another restoration is the better option, and discusses this with you before any treatment starts.

Placing a sealant is quick and does not need any anaesthetic, because no tooth structure is removed. The steps below show what happens during a typical appointment.

Most sealants are placed in a single, short visit; your dentist tells you if additional teeth need treatment as well.

There is usually nothing specific to do differently after a sealant is placed, since no anaesthetic or drilling was involved. Very occasionally a sealant can feel slightly high against the opposite tooth when biting down; if this does not settle within a day or two, your dentist can adjust it.

Normal brushing, including fluoride toothpaste, and regular check-ups continue as usual. Sealants are looked at as part of your routine check-up and topped up or reapplied if they have worn away, so keeping to your check-up schedule matters more than any special aftercare.

A well-placed sealant reduces the chance of decay starting in the grooves it covers, for as long as the sealant stays intact. Many sealants last several years with normal wear, though how long any individual sealant lasts varies with diet, how the tooth is used, and grinding habits.

Sealants do not change the appearance of the tooth in any noticeable way; the material is usually tooth-coloured or clear, and the seal is checked at your visits rather than judged on how it looks.

Sealants only protect the grooved chewing surfaces they are applied to; they do not protect between teeth, where a different type of decay can start, or the smooth outer surfaces of the tooth. A sealant can also wear thin or chip away over time and needs to be checked, and topped up or replaced, at routine check-ups rather than assumed to last indefinitely.

Because grinding can wear a sealant down faster than normal chewing, a patient who grinds their teeth may need sealants checked more often; see our bruxism treatment page if grinding is a separate concern.

Your dentist explains which of these apply before you go ahead.

"Sealants are only for children." Children's newly erupted molars are the most common candidates, but an adult with deep, decay-free grooves and a higher risk of cavities can also be considered for a sealant.

"A sealed tooth doesn't need brushing." A sealant only protects the grooves it covers; the rest of the tooth, and the gaps between teeth, still need normal brushing and interdental cleaning.

"Sealants replace fluoride." Sealants and fluoride protect teeth in different ways and are often used together rather than as alternatives to one another.

"Once placed, a sealant lasts forever." Sealants can wear or chip over time and are checked, and topped up if needed, at routine check-ups rather than left unchecked indefinitely.

At Er Dental Clinic, whether a sealant is the right choice for a tooth is assessed by Dt. Vijdan Aslanoğlu, alongside our other dentists in Istanbul, at a check-up that looks specifically at the depth of the grooves and whether any decay is already present. A sealant is only recommended where it is genuinely likely to help; a tooth that already needs a filling is treated as a filling rather than sealed.

The clinic holds an International Health Tourism Authorisation Certificate issued by the Republic of Turkiye Ministry of Health (certificate no. ST-6264), which you can check on the e-Devlet document verification service at turkiye.gov.tr/saglik-bakanligi-ebys.

Where a groove already has early decay that has not yet formed a full cavity, fluoride treatment can sometimes help support remineralisation instead of, or alongside, a sealant on the surrounding grooves; our fluoride treatment page explains when this applies.

Once a cavity has fully formed, a tooth-coloured filling is the usual next step, and our tooth fillings page covers this in more detail. Regular dental cleaning also supports the same preventive goal by removing the plaque that sealants and fluoride work alongside.

Dental sealants are one part of preventive general dentistry, alongside dental cleaning and fluoride treatment. If a tooth needs more than prevention, our general dentistry page also covers tooth fillings, root canal treatment, tooth extraction and inlay or onlay restorations.

A sealant and a filling solve different problems. A sealant is a preventive coating placed over grooves that are still free of decay, while a filling repairs a tooth where a cavity has already formed and some tooth structure has to be removed first. If your dentist finds early decay in a groove that would otherwise be sealed, a small filling may be recommended for that tooth instead.

Send us your photos for a free online consultation, and our dentists will let you know whether a sealant, a filling or another option fits your teeth, alongside whatever else brings you to Istanbul. You can also contact us directly with any questions.