There are different types of dentures, but they share a common function. They replace teeth that have become loose due to bone loss or have been extracted. No one enjoys losing their natural teeth, but patients can achieve the goal of eating and talking normally and having a natural, beautiful appearance. Dentures are fitted to go over or around whatever teeth remain in the mouth, or replace all the teeth in the mouth. Often implants can be used to further stabilize a denture. A Teeth-In-A-Day treatment, also known as an All-On-Four treatment is a type of denture which is held in place by implants.