I've been using the kit I got on another deal a few weeks ago and I really think the little light gizmo makes a huge difference and this one has the strips already filled and seems like less hassle than the trays I've been using and I have many years of coffee and red wine to erase so I already knew I was going to need another round or maybe two of teeth whitening. Thought I'd share for any fellow knotties who might be interested
https://www.livingsocial.com/deals/294564?ref=conf-jp&rpi=51837440This is a referral link.