Misc: With natural active ingredients. One patch fully treats most sores. Last 8-12 hours. Immediate pain relief. Total protection from food & drink. Easy, effective, freshens breath. Forms a clear gel patch. Canker Cover adheres to any mouth ulcer and becomes a clear, gel-like patch. One patch fully treats most sores (J. Pharm. Sci., 12/04.). Benzocaine-free. One patch fully treats most canker sores. Relieves pain/shields the sore. Clinically proven effective. Fast treatment. Harnessing the power of natural ingredients. 100% recycled paperboard. Contains 55-65% post-consumer waste. Please recycle.