Dental Implant
What it is: A titanium rod placed in the jawbone. The rod fuses to the bone in three to six months; then the dentist attaches an abutment to the rod and, finally, a permanent ceramic or porcelain crown.

Best for: Those with healthy gums and enough bone to support the implant. If a tooth has been missing for a long time or if you have gum disease, a bone graft may be required.

Does it work? Extremely well. "Implants are natural-looking and can last a lifetime," says Kim Harms, DDS, a consumer adviser for the American Dental Association. They won't shift or move, and you don't have to drill adjacent, healthy teeth in order to add crowns to make a bridge. Getting an implant is a surgical procedure and requires a few days of recovery time.

Cost: $1,000 to $4,000 per implant.

— Research by Kate Sandoval