We all know that teeth are important to us. Children under 6 years old have 20 baby teeth. From 6 to 13，they lose their baby teeth one by one. Then permanent teeth （恒牙） begin to grow. Between the ages of 17 and 25，some people grow wisdom teeth （智齿）.
Teeth are important to everyone. Healthy teeth help us eat enough food to grow. They help us speak clearly. And yes，they help us look good.
Do you know how to keep our teeth strong and healthy？We should brush our teeth at least twice a day，in the morning and before bedtime. Brush up and down on every tooth，and brush for at least two or three minutes every time. And get a new toothbrush every three months. At the same time，we can't eat too much sweet food，drink too much cola，or eat snacks before going to bed.
Take care of our teeth，and we will enjoy a better life with them.
The growth of teeth | Children under 6 havebaby teeth. Children begin to grow permanent teeth when they are 6﹣13. Some people growwhen they are 17﹣25 |
The importance of healthy teeth | They help people eat enough food， and look good |
How to keep teeth strong and healthy | Dos ◆Brush teeth at least twice a day. ◆Change a toothbrush every. Don'ts ◆Never have too much sweet food or cola. ◆Neverbefore bedtime. |
