洗牙

洗牙	xǐ yá	(dentistry) to perform or undergo scaling (removal of dental plaque and calculus)
洗	xǐ	to wash; to bathe / to develop (photographs) / to shuffle (cards etc) / to erase (a recording)
洗	xiǎn	used in 洗马
牙	yá	tooth / ivory / CL:颗