Last month, Tom’s of Maine asked consumers to join in the Natural Challenge, a national program created for people who want to support their health and wellness with natural oral and body care products but have hesitated to try them because they’re not sure they’ll work as well as conventional brands. So certain about the efficacy of its products, Tom’s was offering any one who took the challenge a 100% money-back guarantee if they were unsatisified. To promote the program, Natural Challenge dis...