28.
The optimum level of fluoride concentration in water is:
a. 0.7 to 1.2 ppm.
b. 1.2 to 2.0 ppm.
29.
Fifty percent of teenagers are free of dental decay where there is fluoridated
water. What is the percentage for nonfluoridated communities?
a. 20 percent.
b. 10 percent.
c.
5 percent.
30.
Less fluoride is needed in a community water system in:
a. Cooler climates.
b. Warmer climates.
31.
The typical prescription of sodium fluoride tablets for a child 3 years of age or older
is:
a. One 2.2 mg tablet dissolved in 1 quart of water.
b. One-half of a 2.2 mg tablet each day.
c.
A mixture of vitamins and sodium fluoride.
d. One chewable 2.2 mg tablet each day.
32.
Daily use of toothpaste with fluoride additives reduces caries by:
a. 20 percent.
b. 30 percent.
c.
20 to 40 percent.
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