Most 3rd molars get cavities or gum disease because they are hard to reach and clean. Those that fail to erupt fully develop cysts or get serious infections when bacteria invade the tooth's growth sack.
Most people have a healthier mouth long term if the wisdom teeth are removed early.
About age 16 - 18 is ideal, before the bone becomes dense around the tooth. Also, periodontal disease is much less progressive in people who have had those difficult to clean teeth removed. It's a wise move and truly preventive dentistry. Email Dr. Williams.