Dental Sealants are a resin that is placed over and into the fissures (the deep grooves) on the chewing surfaces of back teeth in order to keep sugars from food and plaque from getting a foothold and causing tooth decay in these decay-prone areas.
These fissures in the teeth are often wide enough for sugar molecules and bacteria to be lodged in them, but too narrow for a toothbrush bristle to get in deep enough to clean out the bacteria. Sealants are placed instead of fillings only BEFORE decay is present. Sealants do NOT prevent decay from forming BETWEEN teeth, however. So, don’t forget to floss!