Hi, I'm 22 years old, i've never had a kidney stone in my life. I'm not overweight, 117 pounds, 5'5. I passed a kidney stone yesterday! The only thing I did different was brush my teeth with the new Dr.Christopher's herbal tooth powder I just recieved and went to sleep with it in my gums, the next day, i have a kidney stone.....I know that the tooth powder is suppose to help with calcium in the teeth, helping your teeth to absorb calcium. I think that kidney stones have to do with a calcium build up or something. I haven't done anything different in my lifestyle, just introduced tooth powder. I did have some pizza which I haven't had in a year, but i've eaten pizza before and never had this happen. I didn't have any pains, it was a tiny smooth stone.