Throbbing Toothache Root canal & crown over 6 years

6 years ago I went to the dentist he put a white plastic thing in my mouth told me to bite down and it hurt so bad and I was told I had a cracked tooth and needed a crown.  So I had a crown put on.  This did not aleviate the pain.  A few years later I had a root canal done by an endodontist who drilled a hole through the crown.  I had 4 canals and not the typical 3.  After this the pain did not go away it has been 2 years since the root canal.  My xrays come back good no signs of problems.

How is it after 6 years I still have pain in the same tooth?  
I still have part of my tooth under the crown Could it be that my tooth that remains is still cracked?

I am having a pulsating throbbing toothache that will not go away.. I need help, advice, suggestions. PLEASE

[Gellia]

Hi,
You are probably correct.  

The tooth may still be cracked.  Many times an xray will not show a crack in the tooth.  

Maybe you should pursue your next alternative.  Have you considered an implant?

Hope this helps.
My best to you,
Gellia

[tomt804]

try to see at least 2 more dentists and get other opinions. it's worth the consultation fee.