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In order for your head to become a black hole, I would have to crush it down to 1.41x10^-26 meters (0.0141 ym (yoctometers)) in diameter. Your head would then be 1.468x10^-78 m^3 (1.468x10^-6 ym^3 (yoctometers cubed)) in volume. Your newly-sized head would fit 7.112x10^76 times inside your pre-crushed head. This is just a few orders of magnitude short of the number of atoms in the visible universe. In other words, it would take almost a universe-worth of atoms of crushed heads to refill a shell of your current head.
I’ve only done this once before.