Certain Dri Deodorant Extra Strength Clinical - Powder Fresh is the number one doctor recommended brand for good reason. They've helped people control their excessive perspiration concerns for years with their Certain Dri 72 hour protection antiperspirant. The formula contains aluminum sesquichlorohydrate, the ingredient that has been clinically tested to show superior and longer lasting protection. Certain Dri is to be applied only at bedtime.