I had braces for 14 months & I'm not happy with the results. My teeth are straight but they're angled. Can it be fixed? (Photo)

My teeth were straight but they were "slightly angled". We tried fixing this by wearing retainer. Although, had some alignment issues since I don't have enough space in my mouth to fix the angulation of my teeth, and therefore would have to get 4 teeth removed. I'm going off to university in the fall, &some orthos tell me that the angulation& the alignment of my teeth can be fixed with invisalign will others say it can't. Also, my bite was corrected and now my dentist says I should get it fixed.