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. 刷牙时哼首歌吧
要把满是细菌的牙斑完全刷干净,理想的时间长度为至少2分钟。用手表计时或者在卫生间里放一个计时器,定时2分钟。或者找一支两分钟长度左右的歌曲,刷牙时把它哼完。