A sealant is a protective covering that is placed over a tooth
so that it is harder for the bacteria to attack it and cause a cavity.
Material is flowed into all of the cracks and grooves to protect
them and then the material is cured to a hard state.
99% of the time the teeth that are
sealed are the 1st and 2nd adult molars.
These teeth come in at ages 6 and 12 respectively.
Any tooth can be sealed but it is typically these two teeth
because they are the most likely to get cavities and they
are the ones the the insurance companies will pay for.
You children don't need sealants but it sure does help.
Adults can get sealants on their back teeth but you will pay for it all yourself.
If you are interested, talk to your dentist.