Help needed from a dentist! Root Canal tooth...?

I had a root canal done a few years ago in high school.





I am scheduled to have another one in a week on my back left molar for cold sensitivity. The endodontist said that nothing was wrong with this tooth and that he would only be doing the root canal to ease the intense pain I have when I have something cold.





Well, this past week I have noticed something happening to the tooth I had a root canal on (this is right next to the tooth I'm SUPPOSE to be getting the root canal on). First it just felt like the top of my tooth was "a bit sticky" like it stuck to my upper tooth when I bit down.





Since yesterday it hurts to TOUCH the tooth. Even brushing it hurt last night. My question is: is the cold sensitive tooth not really my problem, is it just stemming from this tooth that possibly had a bad root canal operation done?





Is this "root-canaled tooth" infected? What could it be? I know root canals can go wrong/bad.

Help needed from a dentist! Root Canal tooth...?
1. If you are having intense pain from cold in this region, then this has to be coming from a tooth with a "live" nerve. Therefore, the COLD PAIN cannot be coming from the previously RCTd tooth.


2. The pain on touching the previously RCTd tooth could either be referred pain from the cold pain tooth, or it may be a different problem altogether.


3. A previously RCTd tooth may sometimes give pain to biting pressure if the tooth has fractured, or if reinfection has occurred.


4. Do you have a crown on the RCTd tooth?


5. I'm curious as to WHY the endodontist thinks you might be having this degree of sensitivity in the back tooth? Have you been given any reasons? Have you had teeth removed behind this, like a wisdom tooth?
Reply:A infection will cause slight pressure and raise the tooth up slightly. It will make the bite on the area change and cause discomfort. It is possible it could affect the tooth in next to it because of the same pressure. A root canaled tooth is more weak and brittle than a non canaled tooth and is prone to crack. I'm not an expert but I would find out what is wrong with the sore tooth before having the root canal done. Unfortunately sometimes a cracked root is hard to read on an xray because of the angles. If you are not comfortable with the Endo go see a Periodontist, their specialty is everything under the gums. They may then refer you to another Endo or put you on a bout of antibiotics.
Reply:Not sure if this will help or not but here goes. I had six root canals less than two years ago. I went to a new dentist two days ago only to be told that every single tooth that I had a root canal done has cavities. The reason: The original dentist who placed the crowns did not get a good fit, allowing food, ect to settle under the crown and bacteria started growing causing cavities. It is very hard to see these cavities on x-ray (according to my new dentist), they found mine while cleaning my teeth and checking for gum disease, using that little metal hook they could easily push it to my tooth in the space between my crown and gum line...thanks to the ill fitting crowns. Maybe you have a cavity in the tooth you had the root canal in and it has spread to the tooth next to it...if that is possible...not sure really. Have your dentist check the tooth with the root canal for cavities.

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