牙齿（tooth）是我们口腔中很重要的组成部分，没有tooth，很多美食我们都无法享用了。另外，在特别危急的时刻，tooth也可以成为我们自卫或者攻击的武器。这大概就是很多英文短语中tooth都用来代表力量的原因吧。
1. set/put someone’s teeth on edge 使某人觉得紧张不安或不舒服
The on-the-spot punishment of the criminal put Harry’s teeth on edge.
现场处罚罪犯让哈里觉得很不安。
2. be armed to the teeth全副武装，装备齐全
Hitler was armed to the teeth when he launched the World War II, but in a few years, he was completely defeated.
希特勒在发动第二次世界大战时全副武装，可是没过几年，就被彻底打败了。
3. draw/ pull someone’s teeth off 使某人丧失能力，使某人变得无害
The explosion of the fort has pulled our enemies’ teeth off.
敌人碉堡的爆炸已经让他们丧失战斗力了。
4. take the bear by the tooth 虎口拔牙，铤而走险
We can pursue the strategy of market diversity rather than taking the bear by the tooth into the real estate industry.
我们可以走市场多元化道路，不用铤而走险，专攻房地产。