Dental veneers provider in City of London: Custom trays help ensure that bleach stays where it’s intended—not on your gums, where bleaching gel causes free radical reactions and damages them. Since everyone’s smile is different, we shouldn’t all be using the same size tray to whiten our teeth. This is why I recommend the custom whitening trays available from your dentist rather than one-size-fits-all whitening strips or non-custom trays. At Bishopsgate Dental Care we use two different types of filling to restore and repair your teeth. White fillings also known as “composite-bonded fillings” and porcelain fillings are also known as …