A crown is a tooth-shaped cap that is placed over a tooth. It is used to strengthen and protect your tooth structure. Most crowns are made of a hard, white substance to help them look natural. A dental bridge covers or “bridges” the gap between missing teeth. After you lose a tooth, we may suggest that you get a bridge. A bridge can keep your other teeth from moving out of place. Once a bridge is placed, it works just like your natural teeth.