Instructions: Main ingredient: medical grade polyacrylic acid resin, photoinitiator, camphorquinone Safe and Soft - Adopts medical grade polyacrylic resin ingredients, soft like silicone, no harm and comfortable to use. Very easy and safe to remove from gums. How to Use Gingival Barrier Protection Gel? Step 1: Remove cap on the top of the Gingival Barrier, apply the long cap to the Gingival Barrier. Step 2: Use cheek retractor to open your mouth. Step 3: Apply the Gingival Barrier gel to the surface of your gums. Step 4: Use curing light to speed up dry process and then doing teeth whitening treatment. Step 5: Take off the Gingival Barrier Gel and rinse out your mouth. Gum Protector - Protects the gums and soft tissue during the teeth whitening treatment. Wide Application - During the teeth whitening treatment, it can be harden in about 2 seconds, doesn't stretch lips or feel uncomfortable. Suitable for dental clinic, beauty salon, dentistry and home use. WARM TIPS: Storage conditions: Keep in a cool and dry place away from sunlight! If the external ambient temperature is too high, the extruded gel may become thin (runny/watery). It is recommended to place it in the refrigerator for one hour before use. Warning/Disclaimer Disclaimer: This item may be intended for use by professional health care providers only. The seller may ask you to provide evidence that you are a qualified health care provider and are entitled to buy and use certain items in your country.