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。
The tooth is rinsed and dried. Then new cotton is put around the tooth so it stays dry.
再次清洗牙齿并擦干。把新棉条放在牙齿周围使它保持干燥。
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