Dental Research Study Tufts University School of Dental Medicine This study is comparing four products to determine which is best at removing plaque and reducing bleeding. There are a total of 4 visits over 30 days. You may qualify if you are: Between 18-65 years of age In good general health Do not smoke Can come to the office for 4 scheduled visits and follow study procedures Tufts Dental Study Contact: (617) 636-4099 or susan_a.macdonald@tufts.edu to schedule a screening appointment