how-to-protect-your-teeth.ppt

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1、Our opinions: brush our teeth after every meal. choose herbal tea instead of fizzy drinks(汽水）, and snack on fruit not sweet candies. some surprising things that could ruin your smile Herbal tea Reasons：Many fruit teas are acidic sidik (酸性的）and eat away at tooth enamel inml（釉质 ） ,with lemon and black

2、currant（黑加仑) among the most damaging.How to reduce the risk? Stick to black or green tea Compounds(化合物） in black tea can attack the bacteria that form plaque pl:k, plk （牙菌斑 ） and prevent the plaque from sticking to teeth. Antioxidants(抗氧化剂）,called catechins（儿茶素）, in the green tea stop bacteria in th

3、e mouth from producing acidsid （酸）.Healthy snacksEating healthy fruit, seeds and nuts little and often（少食多餐）do your teeth harm.Reasons: Saliva slaiv(唾液） takes about an hour to neutralise nju:trlaiz（中和） the acid created by a food or drink. But a tooth can only withstand(抵抗） five acid attacks a day .H

4、ow to reduce the risk?1.Stick to three meals a day and avoidsnacking. 2.Eat snacks all at once 3. Rinse your mouth out with water or chew sugar-free gum Eye dropsWhy? 1. cause dry mouth 2.reduce the production of saliva(唾液）Way to reduce the risk: gums, lozenges(含片） and gels （牙胶） sugar-free sweets swimming Reasons：The Chlorinekl:ri:n (氯） affects the PH of the water andmakes it acidic, so swallowing it can lead to tooth erosion（蛀牙）and yellow teeth. What should we do？1.Try to keep your mouth closed while swimming.2. Dont brush your teeth straight after your dip