I found it tedious and will not try it again
I have never used a whitener before because it seemed too laborious.  This is not quite so; however, I found it tedious and will not try it again.  Also, once you do it, you need to get the maintenance kit, but you cannot buy it separately.  That is inconvenient and a little strange.  If you try this product, you should buy the more expensive kit that includes everything.
Rating: 3 stars