At PostalAnnex+ in Long Beach, we take professional US passport photos, accepted by passport processing agencies. Most stores accept walk-in's, so no appointment is needed, but call the phone number at the top of the screen for your passport photo needs.
This silver sulphide tarnish can be quite easily removed using polishes that contain abrasives to rub off the silver sulphide, but these have the disadvantage of also removing small amounts of silver. Handily, chemistry provides a method which sidesteps this problem.
The only way to eliminate calculus build up is by brushing and flossing frequently. It takes pyhsical removal of the placque before it calcified into the hard tarter, or calculus. Some people will have more tendency to build up calculus because of the chemical composition of their saliva.