Bottom teeth inward

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So I had a surgical mold made for my bite, and they were certain this mold would be the last. Yet when they looked at it the bottom teeth were going inward. The bite fit it was just the right side of my bottom teeth were going inward, and they said they think it could take 3-5 “visits” aka months to get it ready. I am curious if the teeth going inward is a problem that can be fixed with braces, because it looks like I bite problem since I have an underbite and a cross-bite, and I’m already suppose to be getting surgery correct my under/cross bite, and I am wondering is have jaw expansion surgery along with the double jaw surgery could fix my bite going inward that way it could be “perfect” the way they want.