每当两个牙齿接触，有可能对细菌在它们之间。
Whenever two teeth are touching, there is potential for bacteria to be between them.
蛀牙发生时，牙齿受到攻击，酸，这可以发生在两个方面。
Tooth decay happens when teeth are attacked by acid, and this can happen in two ways.
不过，还有两个更为严重的健康问题，普通的牙病不只让人失去牙齿，还会失去性命：它们可能引发牙周病和口腔癌。
But there are two much more serious problems, common dental diseases that can lead not only to loss of teeth but also to loss of life: periodontal disease and oral cancer.
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