so far these heads have been the best 3rd party heads, they claim to be food safe and have DuPont threads which no other 3rd party heads are. I can't verify their material claims myself, but the bristles feel high quality and I can believe they use DuPont materials when I compare them to my previous heads. They're fairly hard, but not hard, and significantly softer than other third-party heads I've used that border on hard. The parts other than the bristles feel well made too, so far I've found this to be the best value for money in an Oral-B toothbrush head. The heads feel just as good as the Oral-B heads and are just as effective, albeit significantly less expensive.
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