I had an extra set of half developed front teeth. By the time I was in 7th grade, all my adult teeth were in except the two upper front ones. They were still these strangely small baby teeth in an otherwise normal sized mouth/face.
X-Rays revealed that the adult teeth hadn't been able to eat away at the roots of the baby teeth and make them fall out (as normally happens), because there were a set of "mutant buds" in between the adult and baby teeth. The adult teeth were trying to move down, but were blocked. This battle was happening way up high in my gums, just about where your upper lip attaches on the inside.
So I had to go to an oral surgeon, who cut out the baby teeth, the mutants, and carved away JUST enough gum to reveal part of the surface of each of the two adult teeth. Then they gave me braces that were basically normal, except the wire travelled sharply UP, right in the front, secured to a pair of brackets glued to the adult teeth. They used super aggressive tension and pulled the two down in the matter of weeks. It hurt like hell, but they got it done quick.
(unfortunately, the trauma "killed" one of the adult teeth and made it go dark without a root in the middle. So I've always had a "dead tooth" right in the front. It's strong, but has no root nerve, thus is a darker color and kind of a different translucency. There's no way to fix it other than veneers, but... shit's expensive.)