Hi hope you are doing well,If I have an already opened kosher lepaysach toothpaste do I need to buy a new one before yom tov? is it different for mouthwash, chapstick?
If the toothpaste etc. is kosher for Pesach there is no need to get a new one. With the ChapStick stick, since it touches you lips when applying it, and your plips might have had some crumbs on them when the ChapStick was put on, take off a very thin layer of it, before using it on Pesach.