Catch and Release doesn't mean much if the fish is scratched, dropped, and mishandled while you try to take the hook out of their lip - this is why we invented the Lippa4Life. By using the Lippa, one is able to control a fish by holding onto their lower jaw thereby making it easier to remove the hook. If the fish is not excessively large, it is better still to hold the fish by the lower jaw and roll it on its back - as this subdues the fish quickly. We have successfully used it on barracudas, large trout, steelhead and carp.
The Lippa allows an angler to control a fish more easily than with their hands, and less abrasively than with a net (if they have one on them). It is, however, important to always minimize the amount of movement in the fish while holding them with the Lippa - no reason to hurt the jaw. That said, we have had reports of Steelhead and Dolly Vardens injured when thrashing - best way to minimize damage to jaws is to release pressure when fish thrashes.
Similarly, with Pike and Muskie the lower jaw is very thin and delicate so best to lip them on the top jaw. Many anglers like the weight and heft of this Stainless Steel beauty - something you can appreciate when the fish weighs as much as your dog, but with bigger teeth...