Well they certainly should be. What I will say is that at the high school level it is much easier to enforce because wrestlers are required to show officials during skin checks any special equipment that they have.

At the kids level it is much more difficult because officials typically don't do the skin checks, and with 1 match after another all day long, you generally don't look at the wrestlers and make them smile at you, so that you can see their teeth to check.

Often times during a match when it is noticed then it will be penalized, but other than that you may not even notice.