Features:Using 16 high strength between 400 - 520 nm wavelength of blue light, it can whiten the upper and lower teeth at the same time.Based on a LED blue light system, it helps accelerate the whitening process.This product adopts cold light technology, easy operation, short time, quick effect; Mild, no stimulation, no side effects.The teeth whitening light need be used with teeth whitening products to safely and effectively speed up teeth whitening results.Applicable tooth types, such as yellow teeth, black teeth, smoke teeth, etc.Using the step:1. Wash and dry the teeth surface water with teeth wipes.2. Clean the blue teeth whitening light with warm water, and dry it with tissues.3. Connect converter with blue teeth whitening light with power supplier (for IOS system for Apple phone, for Android phone with OTG Function, power bank, computer, Charger with USB connect), with blue light.4. Use teeth whitening gel evenly on the blue light surface, thickness around 1mm.5. Put the blue light into mouth , bit it lightly to make the whitening gel close to teeth.6. Take out blue light and rinse mouth after 30 minutes whitening. If teeth no any anaphylactic reaction can do one more time to improve the whitening effect.Important Tips:1. Regularly use whitening strips every three months to obtain a whiter, brighter smile.2. To reach and sustain a better teeth whitening effect try to reduce or avoid products such as smoking, drinking coffee, tea, colas or red wine, and eating highly pigmented foods such as cherries and blueberries etc.3. Please complete the course of all the strips within a two week period.Warning:For cosmetic use only, do not swallow, avoid contact with eyes, store in cool area away from heat, keep out of reach of children; temporary tooth sensitivity may occur discontinue use upon sustained disconfirm or irritation, not advised for use for those who are pregnant, please use with in 3 month of opening.Note:Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you Package Included:1 x Teeth Cold Whitening Light