高中(學測,指考)◆英文題庫下載題庫

        Brushing your teeth regularly will help you maintain a healthy smile. But that smile won’t last long if you don’t take proper care of your toothbrush and switch to a new one often. According to the American Dental Association (ADA), toothbrushes can harbor bacteria. These germs come from the mouth and can  11   in toothbrushes over time. 

        Many Americans replace their toothbrushes only once or twice a year. The ADA, however, recommends  12   a new toothbrush every three to four months. Children’s toothbrushes may need to be changed more  13   . 

        During those three to four months of use, there are several ways to keep a toothbrush clean.  14   , rinse your toothbrush thoroughly with tap water after use, making sure to remove any toothpaste and debris. Store your toothbrush in an upright position, and let  15  air dry. Most importantly, do not share toothbrushes.