New York City dentist, Keith Arbeitman states thatmost people aren’t changing their toothbrushes enough.
纽约牙医基思.阿贝特曼说，大多数人更换牙刷的频率都不够。
It is suggested that every three months a toothbrush should be replaced.
建议每三个月更换一次牙刷。
Arbeitman explains, "It really depends how often you use your toothbrush.Once the bristles start to bend, you’re not really cleaning as effectively."
阿贝特曼解释说：“这其实取决于你使用牙刷的频率。一旦刷毛开始弯曲，就不能有效地清洁牙齿。”
He says you can check when your brush is ready to exchange by licking your teeth after you brush them.
他说，刷牙后，你可以舔舔牙检查牙刷是不是该换了。
If they aren’t sleek and smooth than it’s time to replace your toothbrush.
如果牙不光滑，那就得更换牙刷了。
