Thank you for your question.There are many reasons why a crown feels high:The definitive crown was made too large because of lab or impression inaccuracies.Your bite has changed slightly since the impressions were taken.The temporary crown was too low and allowed the tooth opposite to overerupt (even fractions of a mm can be felt). The when the final, definitive crown was fitted, there was an immediate lack of spaceYour ligament (that holds your underlying tooth in place is bruised, and the swelling is settling down slowlyFor the first two options you will need to see your dentist without delay - there is not much you can do about it.For the last two, the problem can resolve by itself when the teeth naturally return to their correct positions or the bruising resolves.You can help this happen more quickly by having anti-inflammatory medication such as Ibuprofen (if you are able to take this).In all cases you need to see your dentist as even slight adjustments followed by polishing will give an excellent outcome that should have no long term effects on your new crown.Good luckThomas Dey, BDS, MSc