While made from plastic, sealants are quite strong. However, it is important to keep in mind that sealants are designed to be used in conjunction with good oral hygiene practices. You should continue to brush and floss your teeth as normal. Sealants only protect the surfaces they cover. Cavities can still develop on other tooth surfaces. With proper care, sealants can last for many years. In the event they do become damaged, they can easily be replaced.