Saliva helps protect teeth and gums from bacteria that cause cavities and gingivitis. So a perpetually dry mouth is more susceptible to tooth decay and gum disease.
唾液可以保护牙齿免受引发牙齿腔洞和牙龈炎的细菌感染，所以长期干燥的口腔更易患这两种疾病。
Many medications (including antidepressants and heart or pain meds) can dry out your mouth, which ups the risk of tooth decay.
许多药物(包括抗抑郁药，心脏病和止痛药)会使口干，这就大大增加了蛀牙的风险。
An infallible remedy for toothache: wash the root if an aching tooth in vinegar, and let it dry half an hour in the sun.
对牙痛的一项万无一失的疗法是：把作痛的一根牙齿放进醋里洗净利，然后置于阳光下半小时使之晒干。
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