Like everything in life once you start getting older everything ages with you including your teeth.So I thought I would give this product a try,for the price it was a worth a gamble.I was quite surprised when after a week I cold actually see the difference.I applied it once,sometimes twice a day and gradually I could see the difference. My teeth looked a few shades lighter then they had done due to coffee e.g,and it made me feel slighty better about myself too. Don't get me wrong tho,your teeth aren't gunna ping from dazzling whiteness but they do look 100% better,and my partner could also see the difference.Overall this product was well worth the money I paid,and after a few weeks I still have some left.