Instruct: Classify Amazon reviews into positive or negative sentiment
Query: ouch!

tears up the inside of my mouth. I find myself brushing faster just to get it out because it strips off all the layers of skin in my mouth and gives me sores if I leave it in there too long. though the company may claim that it's good to get rid of dead layers of skin and it's just super powerful antibacterial stuff, I actually find myself having yuckier breath in the morning... besides, I can get a nice clean mouth without the mouth pain and dead skin that I get with this sucky product.