Depends on a number of factors, primarily how well it is taken care of (regular brushing, flossing, good diet, not chewing ice, etc), the type of material (high noble gold has a tighter seal than ceramics), the skill of the dentist, the strength and size of the tooth. For high noble restorations, including porcelain to metal, I tell my patients 10-20 years, but I have seen them last longer. An instructor in dental school had 4 gold crowns placed more than 40 years previously and they were still in excellent condition.
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