Another study at Tufts University, which looked at 583 healthy postmenopausal women, and found that female smokers were twice as likely to lose one or more teeth every 10 years than non-smokers, and that the risk of losing teeth decreases among women who quit smoking.

"The bottom line is that smoking leads to periodontal (gum) disease, which leads to tooth loss," says Dr. Magaziner. "Smoking causes a chain of events in the mouth that eventually leads to tooth loss. The chain starts with plaque build-up on teeth, which is linked to tartar build-up (an even harder, yuckier substance on the teeth), which can cause gingivitis. From there, you step up to periodontal disease, and the final destination is tooth loss."