Teeth Whitening Gingival Barrier / Gum Dam / Gum Protector / Dental Dam Gingival protection gel Instructions: Main ingredient: medical grade polyacrylic acid resin, photoinitiator, camphorquinone It is very soft as silicone and comfortable to gum. A bad gel is very hard and uneasy to take off, sometimes will hurt the gum during taking off Usage : 1. Open your mouth. 2. Take the cap out of the syringe, hold it and squeeze, put the gel on the surface of the gum, Additional Syringe tips will help customer shield the blue gel onto the gum it's about 2-4mm thickness and 3-6mm width 3. Use LED blue accelerator to cure for 40 seconds. 4. Start the whitening process. 5. Cleaning after the whitening process.