Not sure if these are OEM attachments but after trying 3 different types of attachments I finally found one that works. They're a bit pricey compared to others I've tried, but I believe quality comes at a price. They fit perfectly and have very soft bristles. Went to the dentist recently and had plaque build up so they recommended changing heads, it was quite difficult to find the right ones but such a relief when they fitted perfectly!
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