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.
Using a tartar control toothpaste is extremely beneficial for the removal of plaque and tartar. There are a number of chemical ingredients, such as pyrophosphates, zinc citrate, fluoride, etc., present in such toothpastes. These ingredients prevent the build-up of tartar on the teeth (2).