Will Invisalign correct my inward tilted molars?

I sought an opinion from a top 1% orthodontist and he said my case is severe and would require 16-20 months. I didn't think my teeth were that bad but what do I know. Will invisalign really be able to lift my molars upright? Will fixing my narrow arches and overbite/jet screw up my bite? I have TMJ and my teeth already bite down correctly. Will I need IPR, rubber bands...etc.? I feel like a year and a half is a long treatment time; is invisalign my fastest most effective option? Thanks