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．

44．If we want to protect our teeth，we must protect them　　．

A．at the age of 12    

B．at an old age      

C．at a very young age

45．How often should we go to the dentist？　　

A．Every 6 months．

B．Every year．

C．Every month．

46．How may brushes do we need in a year according to the text？　　

A．One   

B．Two     

C．Four．

47．What can help clean our teeth？　　

A．Candy and cola．

B．Fruit and vegetables．

C．Cheese，milk and yogurt．