Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A waste of time/$$, not sure if it was manufactured differently but both broke in 1.5 month

Sonicare is our trusted brand for decade, but both Replacement Brush Heads broke (inside metal arm broke and no longer vibrate) in 1.5 month of usage. We used Replacement Brush Heads before and never had a broken head except for worn brush. These suppose to last at least 5 months. We thought something we did, but the second broke right after replacement. They do look flimsy. Don't think we'll order this product online again.