学进去

Teeth are very important for our health.They will be our lifelong friends.So we should learn to protect them at a very young age.Here are some tips：
First, we should eat right.
*Don't eat too much candy or drink too much cola，or our teeth will go bad easily.
*Have more cheese，milk and yogurt to make teeth strong.
*Eat more vegetables and fruits to help clean teeth.
Second，we should keep these numbers in mind.
*2/Day Brush your teeth at least twice a day：in the morning and before bedtime.
*2-3 Minutes    Brush for at least two to three minutes every time.
*3 Months    Get a new toothbrush every three months.
*6 Months    Go to the dentist every six months for a check-up.
根据短文内容判断下列句型的正（A）误(B)
1．We're too young，so we needn't start protecting our teeth.
2．Cheese，milk and yogurt can keep our teeth strong.
3．We shouldn't brush our teeth after lunch.
4．We can brush our teeth for only one minute each time.
5．At least four toothbrushes should be used in a year.