Bone loss and deterioration in the jaw, or atrophy, occurs where there is nothing to stimulate the jaw, such as a tooth root. Since traditional dental bridges sit above the gum line, they cannot correct bone loss in the jaw. They can, however, keep your natural remaining teeth from shifting, preserving the alignment and structure of your jaw and facial bones so you can still chew, eat, and smile normally.     Implant supported bridges, which attach to small titanium screws placed in the jaw, can help correct bone loss in the jaw, because dental implants act like tooth roots, fusing to the jaw bone.