The grey line you're noticing around the edge of an older dental crown is likely due to the metal base of a porcelain-fused-to-metal (PFM) crown becoming exposed. PFM crowns consist of a metal substructure covered by a layer of porcelain. The grey line typically becomes visible over time for a few reasons, an older crown, a metal crown substructure, gum recession or decay.
Read MoreThe Oral-B Genius 9000 is a highly advanced electric toothbrush designed to provide comprehensive oral hygiene through a combination of innovative technology and features.
Read MoreWhitening toothpastes are designed to help remove surface stains on teeth and make them appear brighter and whiter. Their effectiveness and how they work depend on their ingredients and mechanism of action
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