You should pay special attention to these areas. The brushing process should last about three to five minutes. Don't forget to give your tongue a stroke or two.
一般人刷牙只注重牙齒表面而忽略了牙齦溝，其實，位於牙齒與牙齦交接的這條「護城河」，才是牙菌斑聚集之處，也是牙周病最先發生的部位。