No helmits makes you better and able to take more punches as you can keep your eyes semi open. Look how good Mayweather has become with good helmits.
No, the mouth piece just reduces the cuts inside your mouth. when someone hits you around your teeth you will get cut inside, without the protector.
It does not reduce the power of the punch or reduce knockouts.
It does not reduce the number of teeth being knocked out.
No, they keep your teeth from getting knocked out and your jaw broken off your face.
there main reason is to keep your teeth in one place lol but depends on what brand they are
If boxers didn't wear mouth guards, do you think there would be more KO's without them? Do mouth pieces help boxers get used to punches and absorbing blows?