That's why before they step inside the ring, they already have the license in boxing. And to get that, certainly, they already gone thru seminars and the likes to know what are the do's and don'ts to be observed once inside the ring. Because one mistake, they can easily lose their license, which they have been working for years. This is why boxers don't want to make trouble outside the ring, because they need to take care of their boxing career. Most likely, they also are well-educated in terms of how to secure their body from any potential harm.
even though there is already a boxing license but when the boxers are in the ring and ready to fight I don't think there is any guarantee for them to be able to minimize the damage to their bodies that results in mental health and the most fatal is death because if they are already in the ring What matters is how to win the match. even if they are trained and have a license even if there is no guarantee for the boxers to get out safely in the match because the license is only a written permission to facilitate the affairs of his career not to make the fighters safe from all forms of attack both mentally and verbally