I’m thinking about buying one and I’ve only seen good reviews online so far! Has anyone used it before? Many websites claim that you were the one hour to reach, usually found on the office dentists, with this pen. Here is a website where I saw it. . . . Http://www. just4teeth. com / Liquid-Smile-Professional Whitening Pen-It says: “For immediate results from your liquid smile. enter your own professional one hour, repeat steps 1-6 (above) for the 10 minutes to one hour bleaching.” So just curious about your opinion! It is much cheaper than in the office of lighter and looks much more effective and efficient? Transparent than the trays so it really makes me curious about why its cheap compared to other procedures. . . Thanks in advance! =)