well I can tell you the device turns on and you see a blue light. However, he didn't even have a gel sample, so you could even try the device to see if it worked for you. If you don't have extra money to buy it, the device is useless to you. I wish I could tell you more. It is very unusual to get even one sample.
Crest 3D Whitestrips Glamorous White Teeth Whitening π¦· Kit - 16 Treatments + 2 Bonus Express Treatments
16 Review
Get a Brighter Smile with EZGO Teeth Whitening Strips - 28 Count 14 Days Course, Bonus Shade Guide Included - Advanced New Formula, 6% HP - Whiten Your Teeth Faster!
12 Review
Custom-Fit Teeth Whitening Trays - Moldable, Hygienic, BPA-Free, Latex-Free, Dental π¦· Grade Guard - Set of 4 Mouth Trays for Comfortable Tooth Whitening
12 Review
Crest whitening strips 3D White Professional Effects
12 Review
Wild Fuel Dental Probiotics: Fresh Breath & Healthy Bacteria Support - Vegan, Cruelty-Free Chewable Tablets for Oral Health - 45 Mint Flavored, Sugar-Free Travel Tin
14 Review
The Legend of Zelda: Breath of the Wild game for Nintendo Switch, cartridge
20 Review
Breath Me TM 50pcs Black Fiber Reed Diffuser Refill Sticks 12 inch - Elegant Home Fragrance Replacement
11 Review
π TheraBreath Fresh Breath Chewing Gum: ZINC with Citrus Mint Flavor - Pack of 6 (10 Count)
11 Review