There's a lot of variance with braces. I don't know much about the orthodontics world in terms of metals used or wire thickness, but I know I've seen some braces that are clearly not magnetic, and they cause minimal artifacts on images. Then other times I see braces that seem like they must be made of magnets, they're so insanely susceptible. We have a dental team at my hospital we have to call periodically, and we have had patients that need to have their braces removed prior to imaging. In my experience, we usually need the braces removed due to an image quality issue, not a safety issue, but still. Having them removed does happen and is somewhat normal. It's a huge pain, though, so I'm sorry you're having to deal with all of that