Expert: Tony Appleton BDS DPDS - 4/21/2007

Question
Hi! I had a fairly large amalgam filling removed on one of my molars a couple of weeks ago.  Afterwards, I experienced extreme sensitivity - not really to hot and cold - but when eating crunchy foods.  The new filling was a composite white filling.  Before replacing the filling, I had no problems whatsoever - the dentist just told me that it looks like the filling has a small crack and thus needs replacement.  In the meantime, we replaced the new filling with a sedative to try and get rid of the sensitivity.  It is still the same.  The sensitivity centers around a specific spot - apparently where the filling was the deepest - and if I scratch it with my fingernail, it is extremely painful - as if it was touching a nerve.  Other than that, I do not experience any toothache as such.  My dentist told me that I may need a root canal if it doesn't get better.  How long should I wait after the sedative to see if the sensitivity goes away, and what are your thoughts on the causes of the sensitivity?  Thank you very much for your help!

Answer
Hi Melanie

Whenever we do any work to a tooth the 'nerve' in the middle of the tooth becomes 'irritated'. This can lead to the sort of symptoms you describe, which are not at all uncommon. Generally the tooth settles down back to normal, but on occasion the symptoms persist and root canal is the treatment of choice.

As to how long should you wait - well that really depends on how the symptoms progress - if you notice the tooth getting better then you can just wait until it is completely fine. If the symptoms are worsening, then you need to get it treated.

Regards

Tony Appleton