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Perfect.
Being a feat of strength, it comes down to specialized training with the goal of lifting a heavy weight/ object with your jaw. Is it safe? Use caution, as with all feats of strength, they are not normal and there is a risk you take when you undergo training for any of them. I'm not a dentist either, so if you lose some teeth in the process, make sure you have your dentists' number handy.
The jaw lifting will put great stress on the back of your neck. So start with a comfortable weight and build up the conditioning and feel of the exercise. In the actual feat you'll be either picking up a weight or object straight off the ground or as I do in shows, swinging someone in a swing that's attached to a special jaw device that I made. Start off with high reps of the neck and jaw work. Then after a period where you feel comfortable with the exercises, you can start using higher weight and lower reps. When you get to the lower reps and heavier weight, use caution and have your body in a very solid position. Make a solid base starting with your feet, hands on your quads and feel the strength from the ground through your arms and transfer to your neck and jaw. Now, use caution with higher reps also and you can use same strength base. Your jaw and neck are not the strongest body parts, so chaining and spreading the tension will help you feel stronger and keep the exercises a bit safer.
My last suggestion is one that I like best, a piece of thin steel (I use stainless) with leather adhered to each side that I bite down on. The steel extends out each side of the mouth about 1" and has holes to put carabiners where chains are hooked up to loading pin or other weighted objects. For me this is comfortable and feels about as good as it can and allows me to do the jaw lifting and swinging better.
What might jaw lifting be good for other than cool looking for performances? A stronger jaw may be beneficial for those in MMA or other pugilistic sports where people are trying to knock you out. It certainly couldn't hurt. Hey and you will be chewing your food with more authority as well!
As with all feats of strength, use caution and don't expect results overnight because you have to put the time in to reap the rewards. And with this kind of training, patience & persistence will reward you with less injuries and more victories.
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