Happy Jack Ear Canker PowderNothing else works like our Ear Canker Powder. When used as directed, our powder brought complete recovery within two to five days, even against the most stubborn, chronic cases of long duration. It promotes healing and dries up the inner ear canker as well as the external areas that may become sore and moist from the canker discharge. We recommend cleansing the ears with ether or hydrogen peroxide prior to application. Contains zinc oxide and