Specific Use Method 1Brush Your Teeth Normally Before Use 2Splice The Upper And Lower Parts Of The Tray Together. 3Open The Whitening Gel 4, The Upper And Lower Parts Of The Tray On The Inside Of The Tiny Gel Strip. 5Place The Tray On Your Own Teeth 6Aim The Cold Light Emitter At The Tooth Tray 7Wrap Your Lips Around The Outer Edge Of The Emitter To Secure It. 8Turn On The Emitter Switch. 9After 10-15 Minutes, Turn Off The Emitter Switch, Rinse Your Mouth With Water And Clean The Tray. Precautions For Use 1It Is Recommended To Clean Your Mouth Before Each Use To Maintain Clean Hygiene. 2, Each Use Time For About 10 Minutes, The Use Of The Process Will Be Somewhat Irritating. This Is The Result Of Optical Reaction, If The Teeth And Gums Sensitive Or Pain Should End The Use. 3, The Amount Of Whitening Agent Should Not Be Too Much Each Time, 1Ml Or So The Best! 4, After Each Use, You Should Clean The Dental Tray, And At The Same Time To Clean The Mouth Again. 5, Teeth Whitening Is Not A Day Or Two Can Improve. 6, Warning, Pregnant Women Prohibited, Mouth Ulcers Or Have Other Oral Wounds Did Not Heal Prohibited.