Instruct: Classify the given review into positive or negative sentiment.
Query: Too harsh on the teeth, oversized head

I used to use the oral b toothbrushes and then decided to venture out and try others. After reading the reviews on Amazon, decided to give the Spinbrush Pro a spin. After 3 weeks, I am retiring the Spinbrush and returning to Oral B.The head of the brush is much larger than the head of the oral b brushes. The smaller head is much easier to use and reaches the various crevices that a normal brush and the spinbrush can not get to.The spinbrush is also very harsh on the tooth enamel - much more so than the oral b models. The powerful motor - a gas guzzler by all accounts - is too powerful for me. It's also a little too noisy.If you really want to get this one instead of the oral b, would suggest giving the soft bristles version a whirl instead - the softer bristles might be a little less abrasive on the enamel than this is.But the price and the fact that it does do its basic job - cleaning teeth - keeps me from giving it a 1.