How do you pronounce 洗牙?

Q: How do you pronounce 洗牙? A: sai2 ngaa4, e.g.

洗牙 (sai2 ngaa4) — meaning, pronunciation, examples

洗牙 (sai2 ngaa4, xǐ yá) — (dentistry) to perform or undergo scaling (removal of dental plaque and calculus)

洗地 (sai2 dei6) — clean the floor; to clean up someone's sins committed (spoken)
洗塵 (sai2 can4) — welcome dinner for a friend or relative from overseas (spoken)
洗大餅 (sai2 daai6 beng2) — dish washing as a job (slang)
洗太平地 (sai2 taai3 ping4 dei6) — Operations Tai Ping Tei, mass cleanup
洗底 (sai2 dai2) — gangster giving up his membership or background; turn a new leaf
洗手 (sai2 sau2) — (verb) (of gangster term) to retire