Right?! I had a roommate who would never rinse their toothbrush. I think. I have no idea what else would cause the kind of gross buildup I saw on it, so I think they just put toothpaste on it, brushed then put it back down. The bristles were all crusty and split and there was discoloration on the handle I’d never seen before or since. I wouldn’t want to share with them. They were otherwise pretty hygienic, but I’d rather not brush for a day than use theirs.