The bone tissue graft is a bone that has been modified in laboratory or manufactured, usually by the shape of a small test form. Its source is often human, pork , beef, horsetail, or artificial in whole. It is placed with special surgical techniques to replace the lost bone in the receiver area, resulting in significant biological advantages in both natural and artificial teeth but also in better aesthetics. The grafts are assimilated by the body over a period of 3-6 months.