I have tried many non-original toothbrush heads because Phillips heads are so expensive! These are my favourites. You can get lots of heads cheaply. They have good rigidity, not inferior to the famous brand. They also have blue bristles that fade over time, indicating it's time to change heads. Other replacement parts I have tried sometimes become very loose and fall out of my toothbrush, but they have NEVER had this problem. I hope they don't stop making them.
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