Saliva flow gradually slows with age, which explains why the elderly have more bad breath trouble than younger people do. Babies, however, who make plenty of saliva and whose mouths contain relatively few bacteria have characteristically sweet breath.
For most of us, the simple, dry-mouth variety of bad breath is easily cured. Eating or drinking starts saliva and sweeps away many of the bacteria. Breakfast often stops morning breath.
Those with chronic dry mouth find that it helps to keep gum, hard candy ,or a bottle of
water or juice around. Brushing the teeth wipes out dry-mouth bad breath because it clears away many of the offending bacteria.
Surprisingly, one thing that rarely works is mouthwash. The liquid can mask bad breath odor with its own smell, but the effect lasts no more than an hour. Some mouthwashes claim to kill the bacteria responsible for bad breath. The trouble is, they dont necessarily reach all offending germs. Most bacteria are well protected from mouthwash under thick layers of mucus(粘液)。 If the mouthwash contains alcoholas most doit can intensify the problem by drying out the mouth.
31. The phrase emanate from in Paragraph 1 most probably means______
A) thrive on
B) account for
C) originate from
D) descend form
32. Which of the following is mentioned as one of the causes of bad breath?
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