There are several different types and levels of bone grafts. They are based on the severity and amount of the bone that has been lost. Dr. Velasco, Dr. Barrilleaux and their team will carefully explain to you the type of bone graft you need and the possible success rates associated with your treatment. However, the success rate for bone grafts for the purpose of dental implants is very high. There is a small chance that a bone graft will fail and the failure rate is higher in smokers and those with certain medical conditions. In the event of a failure, the failed graft will be removed and a second graft can be attempted once the area has healed.