不过洗牙次数再多也不能去除由于四环素或系统性疾病导致的牙齿深度着色，因为这些色素已进入你的牙齿内部，你需要采取更加积极地措施来对付它们。
No amount of cleaning will remove the severe staining left by tetracycline or systemic disease because these pigments lie inside the tooth; you'll have to take more aggressive measures against these.
预防牙龈疾病等口腔问题，应该定期洗牙和检查牙齿—— 一般为一年一到两次。
To prevent gum disease and other oral health problems, schedule regular dental cleanings and exams — generally once or twice a year.
问：洗牙后抛光牙齿是否有必要？
Question: is tooth polishing necessary at the end of a dental visit?
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