Eat more.
Shaving does not "make your hair grow back thicker".
Nothing that you can put on from the outside will make your hair grow thicker. (With the possible exception of Minoxidil.)
Really thick.
you have to condicion
Nothing.
They grow thicker.
no it just looks darker and thicker because of stubble
Yes, it will grow back thicker and darker. But shaving your chest itches very badly.
No; that's a common myth. It seems thicker because of the stubble.
they come back thicker so they wont break as easily
Grow a beard.
Eating a healthy diet and taking vitamins can help your hair grow thicker and fuller. Taking good care of your hair will also help.