有效刷牙能很好地预防牙周疾病，但懂得有效刷牙的人并不多。
Brushing teeth effectively can prevent periodontal diseases. But few people know how to brush teeth effectively.
他们说这是提前的建议，良好的口腔卫生可以在预防癌症有某些影响，但也表示，无论什么样的牙周疾病都应治疗。
They said it is premature to suggest that good oral hygiene can have any effect at preventing cancer but said periodontal disease should nevertheless be treated.
牙周疾病预防的原则和方法？
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