One doctor claims that sleep bruxism results in 250 lbs. of pressure on the tooth [source: NY Times].
一个医生声称睡觉时磨牙能施加250磅的压力到牙齿上。
2
Do your want to have your tooth extracted, tooth filled, dressing changed, blood pressure checked?
你要拔牙（补牙，换药，量血压）吗？
3
ScienceDaily (Sep. 6, 2009) - it's been a mystery: how can our teeth withstand such an enormous amount of pressure, over many years, when tooth enamel is only about as strong as glass?