Bibliography lists 4 sources cited. A 7 page paper describing the various phases of periodontal disease and their control. Gingivitis is the most common, and the mildest form of periodontal disease. Periodontitis is by far the most destructive form of periodontal disease, and was formerly believed to be simply a condition of old age. There are several treatment and control measures available now, including a vaccine.
Bibliography lists seven sources.
There are many phobias experienced by people. Some are afraid of heights. Others are afraid of closed-in spaces. One big phobia among today's population is dental phobia. Yes, that's right.