Tooth decay is irreversible once it has fully developed. However, the damages can be restored. A dental filling is a procedure that involves cleaning cavities of bacteria and then sealing them against further infection. First, the doctor will remove bacteria from the infected tooth with a variety of dental instruments. Next, he will enclose the cavity with a white filling to reinforce and protect the tooth. A dental filling acts as protection for future infection. Also, a white filling blends in with your tooth’s structure while restoring your oral functions, such as chewing and smiling.