I just had a permanent bridge (lower jaw) put in a few days ago? (photo)

you need to replace the bridge, even if you do not implants, you have root canals on both, of them,so the height can be changed ,to give space for more porcelain, only if you deserve another bridge,so it would look more natural,

if you deserve  to change for an implant, just change the 2 crowns, holding the bridge ,and you can still set an implant,both things can be performed in just a couple of days.

Unfortunately, the procedure is not reversible. Have a frank talk with the dentist who made the original bridge and voice your concerns.  The dentist has the option to remake the bridge at no additional cost to you,  or give you a full refund if you choose to have the bridge redone by another dentist.  If you get no cooperation and / or satisfaction, you can lodge a grievance with the local dental society.