For many years, I used commercial/retail deodorant sprays. They worked fine in terms of odor protection, but often left a residue that would accumulate over time under the arms of my dress cotton work shirts. This residue was extremely difficult to remove and, in fact, never could be removed completely, meaning that I had to "retire" my shirts prematurely.About eight years ago, I tried using deodorant crystal products and found that they worked just as well, and didn't generate the residue that had been plaguing my dress shirts. An added benefit was that the deodorant crystal was less expensive and lasted much longer (i.e., didn't have to be bought as frequently).Over the years, I've used deodorant crystals from a variety of manufacturers, and they all seemed to work quite well. The reason I purchased this particular product is that I found that crystals in "rock" form last longer compared to the "stick" products in plastic containers. The stick products work well initially, but become harder to apply toward the end (i.e., they become "crumbly", perhaps because they don't dry out completely between uses, and there's always some amount of the product that remains within the container at the end even after screwing the applicator all the way up). Now I buy only the rock form.Of course, the rock form is vulnerable to breakage if dropped (and they can become slippery during application), but I still find them the better buy. Something else to consider is that the rock form takes up considerably less space when packed into a shaving kit for travel.
