Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Cleaning effectiveness: F-. Far inferior to standard brush head

Purchased direct from Amazon - brushes appeared genuine Oral B, right down to the high price (nearly double what they were 2 years ago!). Appropriate markings and all that.I have used all the brush head types, and thought that "sensitive" meant these would be gentle but still effective. Switched to this brush head for a couple weeks. When hubby asked for whitening toothpaste, I noticed that we were both experiencing staining, something that hasn't happened since we've owned a power brush. Thanks to lots of coffee and tea, I can *see* ineffective cleaning before it turns into poor oral health. Threw the sensitive brush heads away and went back to the regular brush heads and our teeth are back to normal now.I would not recommend these for anyone except a brand-new power brush user (for the first brush, while your gums get used to power brushing). If you must use this brush, I would consider switching to the 45-second/quadrant program.