81.What is the primary mechanism associated with the role of fluoride in prevention of dental caries?

a.Fluoride increases calcium absorption, which increases crystal formation of teeth.

b.Decay is inhibited due to neutralization of organic acids produced by bacteria on the teeth.

c.Decay is reduced due to the inhibitory effects of fluoride on growth of bacteria on the teeth.

d.Fluoride becomes incorporated into the crystalline structure of teeth, making them less susceptible to decay.

82.Which of the following mechanisms explains why fluoride is effective in controlling tooth decay?

a.It helps regulate calcium levels in saliva.

b.It helps form decay-resistant fluorapatite.

c.It inhibits growth of decay-producing bacteria.

d.It changes the pH of the mouth, inhibiting bacterial growth.

83.What percent of the Canadian population is exposed to a fluoridated public water supply?

a.10 percent

b.30 percent

c.45 percent

d.90 percent

84.You have just been elected mayor of Smalltownville, where the major source of drinking water is from wells. What major health problem would be expected among the children of Smalltownville?

a.goiter

b.dental caries

c.GI infections

d.hemochromatosis

85.What is the most reliable source of dietary fluoride?

a.public water

b.dark green vegetables

c.milk and milk products

d.meats and whole-grain cereals

86.Janine took her 3-year-old daughter Ella to the dentist.  Ella had developed brown-coloured spots on her teeth, and some teeth were pitted.  Which one of the following conditions does Ella have?

a.hypersensitivity

b.dental caries

c.gingivitis

d.fluorosis

87.Which of the following conditions is a fluoride deficiency best known to promote?

a.dental decay

b.osteoporosis

c.discoloration of teeth

d.nutritional muscular dystrophy

88.What is the Tolerable Upper Intake Level for fluoride?

a.10 mg

b.25 mg

c.60 mg

d.100 mg

89.Naturally occurring food sources of fluoride include which one of the following?

a.coffee

b.apples

c.milk

d.shrimp

90.Approximately what percentage of Canadian children and adolescents are affected by one                                           or more dental caries?

a.30 percent

b.40 percent

c.50 percent

d.60 percent