Think of dental sealants as an umbrella. They shade teeth from all the stuff that can pour down on them, from sugar to bacteria to bits of food that gets trapped in teeth. Sealants have become a major weapon to protect against tooth decay. A sealant is easily applied over the deep grooves in the chewing surface of premolars and molars. Dentists generally will recommend sealants to be applied from ages 4 to 15. These are the years when kids are most likely to get cavities; however, in rare cases, a dentist may recommend sealants to be applied on baby teeth if a child is prone to cavities. Tooth decay is a serious problem among children because of the way their teeth grow. When children get their first molars, they develop deep pits and fissures on the teeth. It is extremely difficult for toothbrushes to reach these deep crevices. Cavities may develop because they cannot be sufficiently cleaned. That is why it is important to protect teeth prior to a cavity developing.
Something to keep in mind: Sealants are less expensive than fillings.
The ADA (American Dental Association) recommends all kids receive sealants in order to protect their teeth as they age.