Experts at the National Institutes of Health say good dental care starts at birth. Breast milk, they say, is the best food for the healthy development of teeth. Breast milk can help slow the growth of bacteria and acid production in the mouth.

　　But dentists say a baby's gums and early teeth should be cleaned after each feeding. Use a cloth with a little warm water. Do the same if a baby is fed with a bottle. Experts say if you decide to put your baby to sleep with a bottle, only give the child water.

　　When baby teeth begin to appear, you can clean them with a wet toothbrush. Dentists say it is important to find soft toothbrushes made especially for babies and to use them very gently.

　　The use of fluoride (氟化物）to protect teeth is common in many parts of the world. For example, it is often added to drinking water supplies. The fluoride mixes with enamel (法琅质)， the hard surface on teeth, to help prevent holes from forming.

　　68. Which of the following can be used as the title of the passage?

　　A. Concerns for Healthy Teeth of the Young

　　B. Importance of Healthy Teeth of All

　　C. Causes of Teeth Problem

　　D. Solutions to Teeth Problem

　　69. What's the main idea of paragraph 4 and 5?

　　A. How to develop babies' teeth.

　　B. Why to protect babies' teeth

　　C. How to keep babies' teeth clean

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