No you don't: Crowns should completely seal any areas of the tooth have been removed prior to crown placement. The edges of the crown should be smooth and flush with the tooth surface at the margins. Once a crown is placed, it is not likely to get a cavity where it seals the tooth. There will be parts of the tooth that the crown doesn't cover. Those can decay, just like any tooth surface - not related to crown
Answered 6/15/2014
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No: A well fitted crown surrounds the remaining tooth structure and protects it. If you brush well and especially floss daily you reduce your risk of recurrent decay. Follow your Dentist's advice.
Answered 6/20/2014
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