Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't waste your money!

I purchased this with great excitement, I had just gotten my braces and planned to keep them clean. I thought I could use it at school since I have a sink. It didn't work at all. I used it one time and the water ran down my arm, I couldn't get any real pressure and the second time I tried to use it, it wouldn't even turn on.I gave it a third chance by charging it one whole day. No dice. The thing just wasn't worth it. I called the company and had a horrid experience there also. The number wasn't 24 hours. I left a message and no one would call me back. I sent an email and no one answered it.Amazon did give me most of my money back but the whole experience left a bad taste in my mouth in all senses of the phrase.