Originally Posted by
Chinatrvl
Whilst I would never drink tap water unless it explicitely states it's good for that, I always use it to brush my teeth etc; regardless whether in Shanghai or small towns. Of course, if the water is brown, I wouldn't
Never fallen ill from that (I assume), but of course YMMV.
Most people who have problems from tap water teeth brushing don't really get ill so much as have persistent intestinal discomfort and mild over activity.