floss
一天刷牙两次，用牙线洁牙一次。
Brush twice a day, and floss once a day.
youdao
你多久刷牙和用牙线洁牙一次？
How often do you brush and floss your teeth?
用牙线洁牙；一般是牙齿。
Use dental floss to clean; of teeth.
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