So this is my 4th pregnancy where I've puked all 9 months and it's best to rinse with water or mouthwash and wait to brush. Brushing immediately can actually brush the stomach acid INTO your teeth and that's not good. Thankfully I haven't had any damage to my teeth, I visited the dentist two months ago for a cleaning. But right now I also am puking every time I brush my teeth. It's a freaking battle.