Review on Zero White Teeth Whitening Pen by Brittany Rodriguez

I've been trying this product for a week now. My teeth seem to be getting whiter, but this only occurs after I put a pin on my teeth (which I do every night). When I wake up, my teeth seem to be back to how they were before. I am a little confused. Maybe I'm not doing it right, but I'm following the instructions. My teeth are also sensitive. This product sometimes makes my teeth ring, but it doesn't hurt. I only feel a little tenderness, but then it goes away. I will update maybe in a week or when I finish this product. And also the twisted part at the bottom of the handle doesn't rotate so I had to remove the plastic "metal" part to rotate the handle to get the product. So far after 1 week I'm just confused. This product is an UPDATE. I've used this product about 14-16 times (which is pretty sad considering it costs about $27). And I haven't noticed much change in teeth whitening. This item is not worth the hype and money. I say look for another alternative to whitening.