T.W.
My sister and I both have excessive underarm sweating and have been using CertainDri for about 3 years now. It is unbelievably amazing! It stings a bit the first few times you use it, but after a few weeks, there is literally no sweating...even when I lived in Austin during teh 110 degree summers. Neither one of us have had any problems, and once you've used it awhile, you can skip to using only every few days.