Instruct: Classify a given Amazon review as either positive or negative.
Query: Beware! Items are defective.

Why are they still selling this item? I bought six heads. Two of the heads broke from the handle. I had used the heads for about 2 weeks each. After the second head broke, I returned the brush heads to Amazon for a refund. After reading the reviews, I can't believe that these heads are still being sold on Amazon. I have been using these brush heads for years (bought from other sellers) and have not had any problems with the brush heads until now. This was the first time I bought the heads from this seller. I won't be buying this item from this seller again.