Purchased the colour corrector serum and have been using for a week in conjunction with whitening strips as recommended. No results, and I have been experiencing gum and lip staining that takes a very long time to come off – very unsightly. When I contacted HiSmile I have been completely disregarded and told that every customer experiences varying results and they have not offered to help me by way of a refund or anything. My husband has also been using it and has also experienced no results, I believe this product to be a total scam. Don’t waste your money.