What Are Kidney Stones? What Causes Kidney Stones?

...............Medical conditions such as Crohn's disease, urinary tract infections, renal tubular acidosis, hyperparathyroidism, medullary sponge kidney, and Dent's disease have been known to lead to kidney stones. It also has been suggested that water fluoridation - the addition of fluoride to drinking water - is responsible for some cases of kidney stones.................

First time I've heard of that.