Canker Cover® is an innovative oral patch which is applied to oral sores (aphthas). The oral patch dissolves slowly over a few hours, thus it does not have to be removed. When the oral patch fully dissolves, a new Canker Cover® oral patch can be used, assuming that it is still necessary. It is recommended that the oral sore (aphtha) area be rinsed, in case the oral patch did not dissolve totally.