It has been shown that less than 5 percent of bad breath comes from stomach reasons. Food odor coming from garlic and onions tends to be picked up by the blood stream and is exhaled through the lungs. Therefore, all breath research has focused on what to do to control sulfur compounds on the back of the tongue and around the gum crevices of the teeth. Beyond that is hard to determine because that is the length of time we have been placing them. They seem to last better than most crowns.
Many stars have bleaching procedures done.
Many have had beautification through the veneering process. A good veneering treatment is undetectable. Coffee breath tends to dry the mouth. The same instruments used to measure sulfur compounds have been used to measure sulfur compounds after coffee drinking. The reduction of sulfur compounds brought on by formulation such as Breath Remedy can help coffee breath.