I had quite a different route to flute playing than the anonymous person up there. I have a bilateral cleft lip and palate, which has meant a great many plastic surgery operations since birth. At 12 I had the most cosmetically dramatic one, an "Abbé flap", where a Y-shaped chunk of my lower lip was rotated and stitched into my upper lip (which involved three weeks with ny lips sewn together in the middle). This left a lump of scar tissue in the middle of my lower lip. I got that trimmed off at 16, but decided to learn the flute before that. I just loved the sound and was going to do what it took.

At the same time, I was getting another consequence of the cleft fixed. My two top front teeth are on a stump of bone which is not connected to my upper jaw at either side, and one of then erupted at right angles, with the edge pointing fore and aft inside of side to side. So an orthodontist rotated it into place with a clamp and a large spring wire across the front of my teeth. That took a few months to twist it round.

So: I didn't start with normal dentition and then learn to adjust to it going wrong. It was drastically fucked up from the get-go.

I also learned the clarinet, years later. Because the plastic surgery never quite managed to seal the cleft, the pressure inside my mouth when playing blows saliva out of my nose. I can stop that by sealing over it with a piece of denture fixative sheet held in place by my upper denture.