text: is urine usefull to clean teeth and what 's the way one can do it? have heard that romans used to have such practices but if is it useful for teeeth cleaning and of course free, how is that it's not an ordinary practice?? as a dentist...i have never come across such a weird thought!! never try anythin like that cuz it might develop complications if u have an unoticed ulcers or grossly decayed teeth.