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Those are excellent points. We don't think of scalp vellus hairs been shed all of the time. Furthermore, the numbers of hairs coming out is largely irrelevant if they are replaced say with females, or if we have a working treatment for males. In these cases, hair in the brush needed to make way and apparently catagen lasts one to two weeks so we can't really brush ourselves bald unless in a mad shed and then it doesn't matter anyway again since that hair was about to go too. Longer hair sort of doubles and triples on itself when you clean the brush so that makes it look like more in count and malformed hairs we typically don't want unless that is all that we have say because of a partially failed transplant. The longer the hair, the more important brushing seems to be in terms of using that sebum to good purpose by coating the entire strand. Hair can therefore actually look shiner, less frizzy and more well protected when brushed.I think there's some innacuracy with the interpretation of the "100 hairs falling per day being normal" statement.
We all have hair fall throughout the day, but most of it is not noticeable, as it's often very small, thin hairs and the times when it is thicker terminal hairs, it's much less than I'd say around 50 per day approximately.
However, when someone is seeing a lot of thicker/terminal hair fall that is noticeable, in the region of greater than approximately 30 hairs, I would start to say it's okay to be concerned.