I saw a few orthodontists, some who wanted me to have a palatal expander. My current orthodontist said there was no need and I have proceeded with Invisalign (have the first set in). I assumed he meant the arch could be expanded with the Invisalign itself but I know now this is not the case. I really hate the narrowness of my arches (they form a V shape) and know I will not be happy without this changed (I'd like the "idealised" U shape arch). Is my dentist right in having Invisalign only?