text: are dental crowns necessary when teeth don't hurt? my dentist wants to give me a crown on a back molar.  this will be my second crown.  the first one made my tooth sensitve to hot and cold for almost 2 years!  prior to this procedure and the previous one i had no pain or issues with my teeth.  my dentist told me the tooth had small fractures where old filling were.  is this necessary or is a wait and see approch better? get it done if you want to save your teeth