Dental implants are titanium posts inserted into your jaw, where they fuse with the bone. They literally become a part of your body. The artificial teeth that go on top of the implants provide normal biting and chewing power, and look completely natural.
Because implants mimic the natural tooth root, they help to prevent the bone recession that usually occurs when a tooth is lost. Since they are attached to the bone, the provide the necessary stimulation to help the bone maintain its mass. No other tooth replacement option does this.
People who have already experienced loss of bone mass can still be eligible for an implant. Bone grafting can promote new bone growth. This is an added step, not always needed. But when it is needed it adds time to the entire process, start-to-finish.