toothache 英[?tu:θe?k] 美[?tuθ?ek] n. 牙痛，牙疼 名词复数:toothaches [例句]One day the aunt had the most terrible toothache.有一天姑妈的牙疼得特别厉害。

tooth是牙齿的意思，而toothache则是牙疼的意思，区别很大，例如

We have over 20 tooth, we have to look after them, give them a good clean daily, otherwise there will be toothache we have to suffer, it will be painful. 我们有20多颗牙，我们要好好照顾它们，每天给它们好好清洁，否则牙痛我们要受苦，会很痛。