Read more How To Use: Clean Oral at first, put on the dental cheek retractor (not included). Take out the cap of sy-ri-nge, bring tips, hold it and squeeze, paste the gel on the surface of gum until it covers and protects gingival well(it's about 2-4mm thickness and 3-6mm width). Use lighting about 30-40 seconds till it become solid Start the whitening process. Remove the gum protector gel after the whitening process. Note:The Gum barrier is used for Protecting gums during the teeth whitening treatment, it can be harden in about 2 seconds. Specification: Type: Gingival Protection Gel. Volum: 3ml. Package Included: 10*Gingival Protection Gel. 1*manual. Comfor To Use: It is very soft, like silicone, very comfortable to use, no harm to your teeth and gums. Main Function: It protects the gums and soft tissue when whitening teeth treatment. aim to remove dirtys from gums easily and safely. Read more Safe To Use: Adopts medical grade polyacrylic resin ingredients, achieve whitening teeth while ensuring safety. What You Get: 10*Gingival Protection Gel. Volum: 3ml. 1* English Manual. Metal Tips: Comes with 10pcs metal tip for precise application. Read more