This is pretty well understood in medicine . . . your child isn't growing at a "normal" rate, whatever that may be . . . you take them to their pediatrician who then refers you to an endocrinologist . . . if appropriate, the endocrinologist gives your child HGH to help them grow . . . since the end plates of their skeletal bones haven't fused yet (ended growing), all their skeletal bones grow from the HGH and they get taller/longer/thicker, whatever.
When the growth process stops a bit later in life, the end plates of the skeletal bones will undergo a process that doesn't allow any further growth.
This process does NOT happen in the lower jaw (mandible) b/c it grows by a different mechanism than long bones. So if you take HGH as an adult, your other bones won't grow, but your other organs/muscles/ect . . . will grow and so will your lower jaw. Growth of the mandible is what causes all the muscle of mastication problems, problems with the way your teeth bite together (occlusion), positioning of your teeth and so forth.
This is why it's so easy for those that know the correct ratios to tell when athletes are taking HGH. You can look at their mandible and it's relationship to the other facial bones. There is actually a very detailed relationship with angles/distances/ect using several fixed points on the skull to determine the proper size of the mandible and how far out of balance it may be from those fixed points. (orthognathics) An orthodontist takes all these measurements every day when planing braces (problems with the teeth) or to refer a pt to an oral surgeon for maxillofacial surgery (problems with the relationship of the bones).
There isn't anything you can do to stop this growth if you are taking HGH. It is going to happen. Like everything, it's dose related per patient.
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