英语翻译一个九岁男孩,有颗牙齿疼得厉害,在母亲的带领下前去拔牙.手术之前与牙医谈好价格为4美元,不了拔完牙后,牙医要价2

A nine-year-old boy,have teeth hurt badly in the mother led to tooth.Before the operation and good price for about dentist $4,not finish pull teeth,dental price after 20 dollars.When the child's mother questioned why the dentist said:"your son is so fierce that he scared four other patients ran away."