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You only need to complete a bone graft if you have a large defect and you are planning on getting an implant to replace the missing tooth, or sometimes you need a bone graft when you are going to put a fixed bridge in (for esthetic purposes). If you don't plan to replace the tooth or you are going to maybe have a partial or removable appliance you do not need a graft. Does that answer your question, or do you need further info?