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Healthy Resolution: Floss Your Teeth 用牙線剔牙
Like many people, you may not be aware that bacteria in your mouth can lead to serious problems if you neglect oral health. You may also be surprised to learn that during a routine exam, your dentist can spot indications of diabetes and heart disease. One simple thing you can do to head off bacteria is floss your teeth. 
head off:to take action in order to prevent something from happening 阻止,防止(某事發生)
He headed off efforts to replace him as leader.
他挫敗了要取代他的領導地位的企圖.
