Thanks for the D2D. Your Periodontist and Restorative dentist will have to work closely together to determine the length, width and shape of your future crowns and veneers. So ask to speak to both dentist together BEFORE you embark on treatment.
Usually, the gums are trimmed to the right height first, then given time to settle and heal. It is only after a period of healing that crown and veneer treatment is started.