http://dentist-bulgaria.com/ A couple of Japanese scientists succeeded for first time in the history to implant a nucleus of a new, completely robust tooth, on the place of an extracted one. This invention opens new possibilities for the dentistry. http://dentist-bulgaria.com/#4 Scientists from the American Periodontal Academy have analyzed some scientific researches, devoted to the relation between the psychological status of the humans and the periodontal diseases. The results confirm a close relation between the periodontal diseases and some mental problems (anxiety, depression, loneliness feeling, and permanent stress). http://dentist-bulgaria.com/#3