Can I make cosmetic requests from my orthodontist for my braces when the primary reason for getting them is medical?

My bite has become misaligned and my bottom teeth crowded with age. This causes me pain occasionally. My dentist will refer me to an orthodontist (I am too old to get NHS treatment) - can I ask my orthodontist to stop my teeth being inward slanting and if I can have my palate expanded, or will they likely treat solely the bite and crowding?

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