Isn’t Japan supposed to generally have safe water? The short answer is yes, but it depends on your location and if your water is tap or well water. I don’t have concrete evidence, but I have heard stories of foreigners coming to Japan only to have their teeth start to go bad after a few months of living here. Japan is rumored to have a good reputation for good drinking water. I lived in a town in a Shizuoka that boasts great fresh drinking water from Mt. Fuji. Sure, it tasted alright, but for whatever reason, my teeth were always hopelessly getting stained and I was getting warnings from dentists…