An implant is a way of replacing a missing tooth by using a titanium screw in the jaw bone to hold a porcelain crown. They can be used to replace from one tooth to a full dentition. Implants have been around for over 20 years and are very reliable. Implants do not work well in certain situations ie if you do not have enough jaw bone in an area or if you are a smoker. The huge advantage of am implant is that it does not affect the teeth either side of a space when replacing a single tooth.