How long should a crown be sore ?

Typically the: Gum tissue might be tender for a couple of days - depending on many factors - if the crown margins were sub-gingival, type of retraction procedure used, etc. If the crown is painful to chewing, it might need an occlusal adjustment (bite adjustment). See your dentist if the pain lingers for more than a week or sooner if the pain gets worse.

Not long: If the soreness is not getting better every day then there is probably something that needs to be addressed. It may be as little as adjusting the way you bite on the new crown.

Few days: After a crown procedure, your tooth or gums may be sore while wearing the temporary crown. After final crown is cemented, sensitivity should subside within 1-2 days. If it does not, you may need the bite on the crown adjusted, or there could be a problem with the tooth's nerve that may require a root canal. Follow up with the dentist if things aren't settling down.