Making English work / Dentist learned a new tongue Yoko Mizui / Daily Yomiuri Staff Writer Although the dental term "periodontal disease" or gum disease, is widely understood nowadays, the term was not familiar in Japan when Eiji Funakoshi, now 59, went to Tufts University's School of Dental Medicine as a graduate student to study periodontal disease in 1971. Not only did Funakoshi get a certifi..