高考英语《流行话题 语境识词4500》Unit 83 Where Does Bad-breath Odor Come From素材

高考英语《流行话题 语境识词 4500》Unit 83 Where Does Bad-breath Odor Come From 素材Unit 83Where Does Bad-breath Odor Come From? We all have offensive breath at one time or another. In most cases, offensive breath originates from bacteria in the mouth, although there are other more surprising causes. Until a few years ago, the most doctors could do was to counsel patients with bad breath about oral cleanliness. Now they are finding new ways to treat the usually curable condition. Bad breath can happen whenever the normal flow of saliva slows. Our mouths are full of bacteria feeding on protein in bits of food and shed tissue. The bacteria emit evil-smelling gases, the worst of which is hydrogen sulfide. Mouth bacteria thrive in airless conditions. Oxygen-rich saliva keeps their numbers down. When we sleep, for example, the saliva stream slows, and sulfur-producing bacteria gain the upper hand, producing classic "morning breath". Alcohol, hunger, too much talking, breathing through the mouth during exercise -- anything that dries the mouth produces bad breath. so c an stress, though it's not understood why. Some people's breath turns sour every time they go on a job interview. Saliva flow gradually slows with age, which explains why th e elderly have more bad-breath trouble than younger people do. Babies, howeve r, 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 salvia 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 ar ound. Brushing the teeth wipes out dry-mouth 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 don't necessarily reach all offending germs. M ost bacteria are well protected from mouthwash under thick layers of mucus. If the mouthwash contains alcohol -- as most do -- it can intensify the problem by drying out the mouth.