Not bad - but no noticeable improvement over other systems
I thought I would take a chance and purchase the pack but after 1 week really don't see any noticeable difference - yes, there is some but nothing I haven't seen from brightening, whightening toothpastes.  I expected more based on the advertising and marketing.  Silly me!  It really is no better than any other product on the market (referring to strips and toothpaste).  I am done using the rinse as it dries my mouth out and is just all around icky.  Will not purchase again.
Rating: 3 stars