Simply apply to underarms after bath or shower while body is still damp, or merely wet stone before applying. (Try it on your feet also -- it works Miracles!) The Thai Deodorant Stone is the most convenient, effective and economical deodorant that you'll ever use. The Thai Deodorant Stone is recommended for the entire family and will not stain clothing, and is safe for all skin types. One stone used daily by one person can last up to one year. Like all deodorants, if rash or irritation develops (although very unlikely), discontinue use. Due to their natural quality, stones will vary in weight, shape, color and size.