Receding gums can be the result of disease or simply incorrect brushing.

牙龈萎缩可能是疾病导致的，也可能仅仅是错误的刷牙方式引起的。

柯林斯例句

Periodontal disease is a chronic bacterial condition associated with receding gums and tooth loss.

牙周病是一种慢性细菌感染性疾病,会引起牙床萎缩和牙齿脱落.

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