2. Hum While Brushing Your Teeth
The ideal amount of time to brush to get all the bacteria-packed plaque out is at least two minutes. Use your watch or keep a timer in the bathroom and set it for 2 minutes. Or find a tune that lasts about two minutes and hum it to the end.
2. 刷牙時哼首歌吧
要把滿是細菌的牙斑完全刷干凈,理想的時間長度為至少2分鐘。用手表計時或者在衛生間里放一個計時器,定時2分鐘。或者找一支兩分鐘長度左右的歌曲,刷牙時把它哼完。