Dunking is painful. There is a consequence for slamming one's hands, wrists and forearms against the rim. Falling from the sky takes its toll on the knees, endangers the ankles.

Why is slam dunk banned?

So, in 1967, the NCAA actually decided to ban the dunk, claiming that it was not a “skillful shot” and also citing injury concerns. Whether or not it was a skillful shot was highly debatable and the injuries due to dunking were a very small percentage compared to other injuries that occurred while playing basketball.

How difficult is dunking?

Challenging: 5′ 10″ – 6′

If you are close to being 6-foot tall, dunking becomes a lot easier. You'll need to jump roughly 24 inches to touch the rim and 30 inches to dunk a full sized basketball (assuming average arm length). ... In this height range, very few people will be able to dunk without training their jump.