Instruct: Classify a review as either positive or negative.
Query: Expensive and not made for the long term!

While the sonicare does keep my teeth much cleaner than a non-electronic brush, it wears out after only a couple of years of usage. Mine no longer charges, and the batteries which power the toothbrush cannot be replaced. I like the simplicity of the essence, but would appreciate a model with replaceable batteries and a more efficient charging system. Moreover, the brush heads are very expensive. All together, I'm not sure that the product is worth the regular expense.