Your mouth will be opened and your teeth will be shown when you laugh. However, the h____ those teeth are, the happier you look. Strong, healthy teeth can help you eat the right food to help you g____ . They also help you speak clearly. But do you know how to take care of your teeth? These should be f____ .
Brush your teeth twice a day after breakfast and before bedtime. If you can, brush after lunch or after eating sweet cakes. T____ your time while brushing. Spend at least 3 minutes each time you brush. Brush all of your teeth, not just the f____ ones. Spend some time on the teeth along the s____ and in the back.
B e sure the t____ you use is soft and should be changed every three months or even less.
Learn how to floss(用牙线清理) your teeth, which is a very important way to keep them healthy. It feels s when you do it at first, but soon you'll get used to doing it. The floss cleans up food that's h____ between your teeth.
Brushing and flossing keep your teeth healthy. You also need to c____ about what you eat and drink. Eat lots of fruits and vegetables and drink water i____ of drinks.
过滤，将得到固体洗涤、干燥、称量，称得质量为a克．
过滤，将得到的固体洗涤、干燥、称量，称得质量为b克．