I see your point. However steel teeth is something different imo. If im not mistaken this happened to evolution? Ofcourse they wont bite harder. But it COULD be that steel teeth are way more durable and can inflict a bigger amount of damage? And most of all it's unethical. Juice is only a good thing if you know what you do. Could be just as much of a disadvantage. I want to know what others think of this. Is it just me that see a problem with steel teeth?

"What about one dog that has natural long teeth verses one who has natural short teeth" This makes no sence to me. It's like saying it's unfair to match a better dog than the opponents.

What i'm trying to say is that I see no problem to juice your dog or do whatever it takes to get him in best possible shape. But when you start replacing parts of the dog with unnatural materials i think a line has been crossed.
JMHO.