Any Embalmers, Morticians, Or Funeral Directors

If an adult decides to get braces on their teeth, but then suddenly dies, are the braces removed before the viewing and the mouth sewed closed? What if I want to have a smile in my casket? Would a funeral home grant such a request? I don't have braces, but I have friends that have decided to get them in their 30's. I'm just trying to help them with the off chance that they die and want to be shown with a happy expression at their funeral..... just not metal mouthed.