bǎo / chí / yá / zhōu / jiàn / kāng / xū / yào / měi / tiān / rèn / zhēn / shuā / yá / hé / shǐ / yòng / yá / xiàn

保持牙周健康需要每天认真刷牙和使用牙线。

Maintaining periodontal health requires careful daily brushing and flossing.