Inlays - If a tooth requires repair and the area of damage is located at the top of the tooth, also known as its cusp, inlays can be placed as an alternative to a dental crown. Onlyas - Onlays and inlays serve the same purpose, however they each cover different parts of a tooth. An onlay is made to cover the biting surface of a tooth. Porcelain veneers are a popular option for people whose front teeth have been stained, chipped or broken. They're made from thin layers of porcelain that are bonded to your existing tooth.