Quick answer
Fluoride and dental sealants prevent cavities in different ways. Fluoride helps strengthen and repair enamel. Sealants form a thin protective coating over the grooves of back teeth. Your child’s dentist can recommend them based on age, tooth eruption and cavity risk.
Key takeaways
- Fluoride helps prevent cavities at every age
- Sealants are most useful on cavity-prone back teeth
- Use only an age-appropriate amount of toothpaste
What fluoride does
Bacteria create acids that remove minerals from tooth enamel. Fluoride helps replace those minerals and makes the enamel more resistant to future acid attacks. It is available through fluoridated water, toothpaste and professional treatments.
Fluoride products are safe and effective when used as directed. A child’s total exposure, swallowing ability, cavity history and water source all matter, so supplements and higher-strength products should be individualized.
How much fluoride toothpaste should a child use?
- Younger than three: a smear no larger than a grain of rice.
- Ages three through six: a pea-sized amount.
- An adult should dispense the toothpaste and supervise brushing and spitting.
- Ask before using fluoride mouth rinse in a child younger than six because repeated swallowing can cause fluorosis.
What sealants do
Sealants are thin coatings placed in the pits and grooves of back teeth where toothbrush bristles may not clean predictably. The application is quick and does not require removing healthy tooth structure.
The first permanent molars usually appear near age six and the second molars near age twelve. Those eruption windows are common times to evaluate for sealants, but primary teeth and adult teeth may also benefit when anatomy and cavity risk justify it.
How effective are sealants?
CDC reports that sealants can prevent up to 80% of cavities in the protected back teeth during the first two years and continue to offer meaningful protection afterward. They must be checked at routine visits because they can wear or chip.
Sealants do not replace twice-daily brushing with fluoride toothpaste, cleaning between teeth, balanced eating habits or regular dental care.
This article is educational and does not replace an examination or advice from your child’s dentist.