Jeff, a producer on The Doctors brushes and flosses his teeth, but on his last trip to this dentist, he was surprised when he was told he might have periodontal disease. Jeff is not alone. One out of two people in the U.S. has periodontal disease, an infection of the gum and the bone surrounding the teeth. It is caused by plaque that stays on the teeth too long and gets beneath the gum causing infection. If untreated, the gums no longer support the tooth, and you can eventually lose your teeth. Jeff visits periodontist Dr. Sanda Moldovan, who does an oral DNA test to determine what types of bacteria are causing the infection.