- 咬人的狗不露齿 yǎoréndegǒubùlùchǐ don't judge a book by its coverThe most sinister people can appear harmless; literally 'the dog that bites does not show its teeth'.
- 咬人狗儿不露齿 yǎoréngǒurbùlùchǐ a biting dog does not show its teethA dangerous enemy often hides their intentions behind a calm or harmless appearance
- 露齿而笑 lùchǐ'érxiào to grinto show one's teeth while laughing or smiling; to grin