I bought some online years ago and want to buy more (my dentist made the trays but their refills were really pricey.)It's 22% strength.
I've only found one online UK supplier Bleach Refills for £43 and the site doesn't have any address or phone number as contact details so I am a bit wary of using it. I think it's who I used before but can't remember.
Anyone got any ideas? Trawled Amazon and Ebay but nothing available that's identical.