Bite turbos on molars - never removed?

Hey, so I used to have braces until I was 16 and my orthodontist put into the upper molars (5 and 6?) the white composite resin bite turbos when she put on the braces. She told me I have a really nice normal bite without any issues, but just so I didn’t knock down the braces.

The fillings on the left side fell out by themselves like a week later on vacation, but the right side stayed in. Since I had a checkup soon after I thought the orthodontist would say if anything is wrong, of course - I was quite young when that happened, and you kind of don’t question the doctors, I mean, she sees the teeth so she should notice if something is wrong, right?

It’s been like 7 years since my braces were removed (and I don’t have checkups with the orthodontist) - the right fillings are still there, and at this point I have no clue which of my teeth should even touch when I put them together.

Is this normal / has it happened to anyone and what did you do?

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I got a new dentist recently and I went to an appointment and told her that it’s bothering me, because I cannot properly bite with teeth actually together (it kind of caused one of my lower molars to turn a bit inside, but it’s technically not a problem for me). She was shocked, tried to file down the molar 5 a bit, but wasn’t sure how deep she can go without hurting the actual tooth. We left the filling on molar 6, but I realize it’s bothering me more and more, because now it’s just one tooth that is “longer/fuller” and is somehow pressing more into the lower teeth. What should I do?

She also told me that my teeth should be apart anyways, but wtf, what is apart? For me apart is like half of an inch, or? My jaw is at this point in constant limbo.

- Additional info: I don’t grind my teeth, but I do seriously play the violin, so I often rest my head on it (as it’s intended with the chin), so I’m now even more confused about how the teeth should be positioned while resting your head on something.

Any advice on this topic would be seriously appreciated!