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It's the non soluble silicones that some companies use to make the hair feel thicker with more volume, blah, blah etc.
If you look at the rubbish they put In some shampoos and conditioners it's no...

I have a hard time with the HHT. Unless you calibrate it its useless.
My hair wont pass a HTT for love nor money, I even had a razor honed by Neil Miller and it wouldnt pass!
My wifes hair will...