i have just purchased soniclen ,which im really pleased with my only negitive is the brushes are to soft. Can i purchace hard head brushes ?

Not that I’m aware of. They only seem to have one brush replacement option, but just different colours. I don’t think the sonic cleaning would work so well anyway with hard brushes. The only problem I’ve had with them is that they work loose on the toothbrush quite quickly if you use it on the high speed settings frequently. The inner plastic brush socket is weak!

Does anyone know if there are round replacement heads for this toothbrush? I can't seem to find any anywhere!

I don’t think they have round brushes for this model. If the do I’ve never seen them.

Will these fit bestek rlt 236b?

If you're talking about this ISELECTOR Rechargeable Toothbrush Black-RLT236 - https://www.amazon.co.uk/gp/product/B01N405F6D - then yes they will. I purchased the replacement heads (just to see if they were the same) June 2019, so at this moment they are the exact same heads for the RLT236 sonic toothbrush. Also bear in mind that there are a number of similar brands (mostly Chinese) that all use the same physical product and just rebrand the packaging with their own name, so any brushes that look like this should also be compatible (especially if they have the same model number).

Units	4 Count
Brand	Soniclean
Format	rectangular
Age Range Description	Adult

Soniclean Platinum HDX Replacement Toothbrush Sonic Head, Black, Pack of 4

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