Answer to Question 1
Dental plaque is the primary risk factor associated with periodontal disease, and the severity of disease is related to the amount of plaque present. Tobacco smoking is another factor, possibly because of its destructive effects on cellular immune responses. The likelihood of developing periodontal disease is increased if a person has a chronic illness that impairs immune status, such as diabetes mellitus or HIV infection. Other risk factors include stress, pregnancy, use of certain medications (including oral contraceptives, antiepileptic drugs, and anticancer drugs), and dental conditions that increase plaque accumulation, such as poorly aligned teeth or ill-fitting bridges. Strategies for reducing risk focus on improving oral hygiene (proper brushing and flossing) and encouraging smoking cessation.
Answer to Question 2
B