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Mushroom, mushroom? Sorry, old internet reference.
https://www.youtube.com/watch?v=NL6CDFn2i3I

In short, no. Honestly, any brush is serviceable. I've used the cheap boar brush from walgreens and...

I started with straights and didn't have a problem. Some guys start with DE's. There's a learning curve with both, the SR's have more maintenance to be learned, but give better shaves (for me). Plus,...