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Combination dental crowns, like most types of crowns, should last somewhere between five to eight years. There’s a good chance that your dental crown will keep even longer if you take good care of your teeth and avoid bad habits that could break or chip the crown. To keep your combination dental crown in good shape, avoid chewing ice or other hard objects or food and don’t bite your fingernails or grind your teeth. You should regularly floss all your teeth, but it is especially important to floss thoroughly around the dental crown to keep away plaque and decay that could weaken the tooth inside.