So, it wasn’t uncommon back in the day to have laws that prohibit certain purchases to happen on Sunday. There are a tone of laws out there that are still in effect.
However, some are more ridiculous than others and this one is no exception. We all buy toothbrushes and it’s common to realize we are out and buy more toothpaste while we do so. Hilariously in Providence, Rhode Island you are not allowed to do so on Sundays.