Erm actually male pubic hairs grow when the chest hairs grow so if you have chest hairs and no pubic hairs there might be a problem
It usually starts growing back about 2 or 3 days after you shave it. But, the growth time is different for everybody so it can even be a week later that it starts growing back.
Yes.
give them some sunlight and water them
you cant really grow more. its a natural thing that you dont really have much control over. you grow however much you grow
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