Works fine but not using with unit it's designed for but similar cos that unit is rubbish

Actually work for me, best ones I've personally tried.

Great one can buy gel refills for the Whitesmile system, which I absolutely love!

I bought this when it was on offer as I was skeptical about these things. I’ve tried various other whitening products without success before. I’ve used it now for 3 days. I did notice a subtle difference after the first day and when I asked my partner after the second day she thought there was an improvement. It’s certainly done something but subtle. Whether it will continue I don’t know. I’m on my third day and no real further change. I’ll keep going and if I’m really impressed I’ll post a further review. 

Wasn't expecting much and wasn't to concerned as they were half price but I can really see a difference after first use. I used with blue light n gum shield...can't wait see how much better they get ..really pleased now.