Aquasonic brand nozzles are rubbish. I bought these to replace the heads that came with my Black Series brush because I've used 6 out of 8 of these in 2 months. They claim that 8 Dupont nozzles last 2 years. HA! The bristles become loose and ineffective after about 2 weeks on average. These ProFlex tips are no different and I am currently using the last of the three packs. They're obviously a lot cheaper than what you'd pay for something like a Philips SoniCare nozzle, so I wasn't expecting a miracle. However, I expected these tips to last longer than 2 weeks. It's a shame because the rechargeable brush itself is great and cleans teeth very effectively (with the new head). Luckily, the Philips SoniCare tips fit my Black Series pen. I'm just disappointed that I'll be spending 3x more than them, but I also get 3x more durability. You get what you pay for.
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