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We can conclude from the passage that the best way to avoid developing tooth cavities is to ----.
Proper diet is an important contributor to preventing
tooth cavities. Although all carbohydrates can cause
tooth decay to some degree, the biggest culprits are
sugars. All simple sugars have the same effect on the
teeth, including table sugar and the sugars in honey,
fruits, and milk. Whenever sugar comes in contact with
plaque, Streptococcus mutans bacteria in the plaque
produce acid for about twenty minutes. The amount of
sugar eaten is irrelevant; the amount of time the sugar
stays in contact with the teeth is the important issue.
Thus, sipping a sugary soft drink over an hour is more
damaging than eating a candy bar in five minutes. A
person who tends to develop cavities should eat sweet
snacks less often. Rinsing the mouth after eating a
snack removes some of the sugar; brushing the teeth is
more effective. In fact, brushing prevents cavities from
forming on the sides of the teeth, and flossing gets
between the teeth where a brush can’t reach. Drinking
artificially sweetened soft drinks also helps, though diet
colas contain acid that can promote tooth decay.
Drinking tea or coffee without sugar can also help
people avoid cavities, particularly on exposed root
surfaces.