Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Gets too hot!

At first I thought, what a great concept. Then my first two toothbrushes burned (bristles became crunchy, plastic melted). Then I replaced the toothbrushes with rubber toothbrushes and did not put them bristle side down and the ends get so hot you cannot touch the toothbrush at first use. I have decided to get ultraviolent protection. Cant keep buying toothbrushes and i want something battery operated (saves energy)