DenTek Canker Relief Advanced 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 ultra-thin patches contain Vitamin E and provide comfort. The oral patches are easy to use – just apply the patch to sore/wound, hold in place and patch will adhere. It is recommended to eat and drink in moderation while in use. Leave the patch on wound for up to 4 hours. Go beyond brushing with DenTek! Help preserve and protect your teeth for a lifetime with DenTek's innovative dental care products. FSA- and HSA-eligible product in the U.S.