Placing sealants is a procedure intended to help prevent tooth decay, not repair a tooth after it has become decayed. No anesthetic (shots) are required, the cost is less than fillings and usually there is no drilling.
Our teeth are covered with plaque, which contains bacteria that produce acid and other harmful substances that cause tooth decay and gum disease. Brushing and flossing are necessary to help remove the bacteria and food debris from the crevices in our teeth. Sealants help by filling in these crevices, and act as a barrier to keep plaque from accumulating in the areas where decay begins. Toothbrush bristles cannot penetrate these tiny pits and grooves, so sealing them is a good option.
The procedure is simple and fast. First, the teeth are cleaned and the tooth surface is conditioned so that the sealant will bond to the tooth. The resin sealant is then applied and usually hardened with a special light. Normally, they are tooth-colored or clear, so blend with the normal tooth shade.