What's interesting to note that with this product the wearing time is indicated by 1 to 2 hours and this 1 time per day.
In the case of a blend med there were 30 min and 2 times a day.
I have worn this on vacation 2 times a day for about 1.5 hours each. Discolouration which could no longer be remedied by coffee and smoke through brushing, these strips have eliminated after 2 days at 70%. After 5 days 100%
So good value unbeatable. Thank you: o)
Hope I could help you