结论注意保持口腔清洁卫生预防颌下腺结石的关键。
Conclusion to pay attention to oral hygiene is the key to the prevention of submandibular gland stones.
牙医说人们能为牙齿做的最好的事情就是保持口腔清洁。
Dentists say the best thing people can do for their teeth is to keep them clean.
乳酸可用作牙膏和其它口腔卫生品的活性物以防龋齿及保持口腔清洁。
Lactic acid can be used as an active ingredient in toothpaste and other oral hygiene products to prevent tooth decay and freshen breath.
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