How many times do you brush one's teeth each day?

你每天刷牙几次？

Children should learn how to properly brush one's teeth.

孩子们应该学会如何正确刷牙。

I forgot to brush one's teeth, so my mouth feels uncomfortable.

我忘记刷牙了，所以我的嘴巴感觉不太舒服。

The dentist recommends that we brush one's teeth for at least two minutes.

牙医建议我们至少刷牙两分钟。

It is important to brush one's teeth every morning and night for dental health.

每天早晚刷牙对牙齿健康很重要。

It is surprising that children who are seven years old don't know how to brush one's teeth.

令人吃惊的是，七岁的孩子还不知道怎么刷牙。