(二)Long time ago, people didn’tuse toothpaste to clean their teeth untila hundred years ago. Before that, peoplecleaned their teeth with lemon juice orhoney. In fact, to keep your teeth healthy,you need to brush them at least twice a day.You have to do that after you have breakfast and before yougo to bed. It is also a good idea for you to brush your teethright after you eat lunch or any sweet snacks.
      It’s important to visit the dentist two times a year, too.The dentist checks for the problems to keep your teeth healthy.
      Finally, you have to be careful about your meals. Eatinghealthy food also helps keep your teeth healthy.
until 直到 in fact 事實上 keep 維持 healthy 健康的at least 至少 twice 兩次 snack 點心 important 重要的dentist 牙醫 check 檢查 finally 最後 way方法
【題組】1. What do we use to clean teeth now?
(A) honey
(B) toothpaste
(C) lemon juice
(D) nothing