A zirconia crown is a type of dental crown made from zirconium dioxide, a very durable ceramic material that offers excellent strength, longevity, and aesthetics. The process of making and placing a zirconia crown involves several steps
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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.
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Whitening 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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