牙醫有省牙漬服務，會用混合粗盬以高速噴射，把牙漬射走。

Darkened teeth, not necessarily 100% related to habit but lack of magnesium, hence thin enamel layer. My actual experience, but not discovered by dentist over a few decades. Only came there, then descaling as a matter of routine.

小弟一日一杯咖嘛同茶，夜晚一兩杯紅酒，搞到d牙黑晒，有冇咩好方法漂白牙齒呢？thx