DenTek Canker Relief Canker Sore Patches help provide relief from canker sore pain and help protect from irritants while promoting healing. Clinically tested to reduce canker sore pain, DenTek Canker Relief Canker Sore Patches also help relieve pain from small oral wounds and irritation from braces and oral ulcers. The flexible and ultrathin patches contain Vitamin E and are easy to use just apply the patch to sore/wound, hold in place and patch will adhere. Go beyond brushing with DenTek. FSA- and HSA-eligible product in the USA.