Bought with Afterpay a set and a refill pack. Teeth are still yellow. Used actually like it says, the last two applications I even tried to leave on for two intervals and still nothing. Teeth at the bottom still yellow as before. Didn’t take pictures because I was for sure it would work. Guess I was wrong. Only had for 3 weeks and still got to finish paying for it. Dud.
Bottom Line: No, I would not recommend this to a friend