Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I wanted this to work - nope

I have an immune compromised child and am always looking for gadgets to help make life safer. This product is going back. First - it will not accept many toothbrushes - due to the plastics they are made from, or rubber components, and no clear tooth brush handles....None of the normal toothbrushes in our house fit the bill for being acceptable...so I went to buy a solid colored simple toothbrush. I followed the directions and used distilled water....ran as directed, but the bristles that were once very soft came out harder than before and a terrible burning plastic smell came from the unit. Also the water chamber was burnt from a gray color to stinky burnt smelling brown inside. It is free to put your toothbrush in the microwave and boil it....just do that.