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I was doing a lot of special gears. I needed exact detail to calculate gear strength. The root becomes very important in lower numbers of teeth. The hob cuts out the root on the side opposite the profile it is cutting. They turn into an ace of spades. I don't have the formulas. I would take...

A "topping" hob does cut a tip curve. The curve is a trochoid generated by the cutter. The only real way to generate the root and tip is the model the hob and generate the profile from that. Albie0803 is correct that non-topping hobs leave a sharp corner. Typically the will be broken with a...