First off, it's a myth that shaving makes the hair grow in darker and courser. Yes, the stubble makes it feel that way because of the edge that shaving created and the width of the hair at that part of the shaft, but the hair composition isn't changing. So, you can put to rest your concern about him altering his body.
One of the more common refrains was the fact that we are trying to teach kids bodily autonomy, and that this right should extend to certain aspects of their appearance.
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