Hockey players and boxers aren't the only ones with snaggle-toothed grins these days. A Philadelphia oral surgeon says skateboarding and racquetball are packing them in at emergency rooms for treatment of broken teeth and damaged jaws. "We used to treat more people who were hurt in car accidents or in fights, but now facial fractures, lacerations and knocked-out teeth are common among sporting young adults," said Dr. Barry Hendler, director of oral and maxillofacial surgery at the Medical College of Pennsylvania. "Skateboarding and racquetball, among other sports, are big causes of the injuries to teeth and jaws that we are seeing in emergency units today," he said. But, he noted, a knocked-out tooth is not necessarily a lost tooth. Many hospitals can reimplant them. "Get [the victim] and the tooth to a hospital emergency unit as quickly as possible, or, better yet, place the tooth back in its socket," he said. If the tooth is dirty, put it in a moist towel or a cup of water for the trip to the hospital, Hendler said. Failing that, hold the tooth inside the cheek so it stays moist, he said. "The success of reimplantation of teeth hinges on maintenance of moisture and the integrity of the blood supply," he said. "The sooner the tooth is reimplanted, the faster the blood supply is reestablished." s An emergency room resident reimplants the tooth, then a dental resident takes over to wire it in place. Previously a rare sight, the dental resident has become commonplace in many hospitals, he said. Hendler said his advice, carried out within an hour, can save a tooth 85 percent of the time.