When baby’s 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 use them very gently.

　　The use of fluoride (氟化物) to protect teeth is common in many parts of the world.This natural element is often added to drinking water supplies.The fluoride mixes with enamel(釉质)，the hard surface on teeth，to help prevent holes，or cavities from forming.

　　But the American Academy of Pediatric Dentistry points out that young children often swallow toothpaste when they brush their teeth.The group notes that swallowing fluoridated toothpaste can cause problems.So young children should be carefully supervised when they brush their teeth.And only a small amount of fluoridated toothpaste，the size of a green pea，should be used.

　　Parents often wonder what effects sucking a thumb or sucking on a pacifier might have on their baby’s teeth.Dental experts generally agree that this is fine early in life.

　　The American Academy of Family Physicians says most kids stop sucking their thumbs by the age of four.If it continues，the group advises parents to talk to their child’s dentist or doctor.It could influence the correct development of permanent teeth.

　　16．The boy with a bad tooth died because ________.

　　A．his tooth disease was very deadly

　　B．the doctor refused to treat him properly

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