How often should you visit the dentist，then? Bodies like Nice, which provides guidance for the National Health Service in England and Wales, say that the frequency of dental visits all depends on the individual. They recommend that children go at least once a year because their teeth can decay(蛀蚀) faster, while adults without problems can wait as long as two years. They even go as far as to say that longer than two years is OK for people who have shown commitment to caring for their teeth.

　　Where does this leave the rest of us the next time we receive a card in the mail reminding us our next dental visit is due? We’d all like an excuse to go less often, and the good news is that if you don’t have any problems you can probably wait a little longer than six months between visits.But exactly how long you can wait before your appointment with the dentist’s chair will depend on the assessment you and your dentist make of your own risk.

　　1．Who supports six­monthly dental check­ups?

　　A．All the dentists.

　　B．Many organizations.

　　中华资源库 ziyuanku.comC．Aubrey Sheiham.

　　D．The National Health Service.

　　2．The research may not prove the idea of six­monthly check­ups because ________．

　　A．there might be other factors at work

　　B．the number of the subjects was big

　　C．the researchers were not qualified

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