Dr. Nivine Y. El-refai, BDS,DDS,MSD

Depending on case complexity an hour to 2 hours and might require more than one visit.

Pain, swelling, drainage

You should see a root canal specialist

Usually not. You should probably be examined by a root canal specialist

No just a small prick and some pressure

You need to see a root canal specialist to evaluate the condition of your nerve and if the tooth is restorable or not.

Yes, after a root canal, it is normal for the tooth to be sore for a few weeks. If you have no contraindication to taking ibuprofen, take 600mg Ibuprofen 6 hrs for 2 days. Also, make sure you get your permanent restoration with your dentist. If discomfort persists, see your dentist or a root canal specialist.

Yes. There are always risks with any procedure. Some of the possible risks are permanent nerve damage where you could feel numb in the area for months to years or forever. The position of the hebtooth in relation to nerves and vessels in the area will determine the percentage of risk. There is also risk of bleeding, bruising, nausea, damage to other teeth. Possible presence of vertical root fracture and the need to extract the tooth. Your endodontist could send you for a specific radiograph called CBCT to determine proximity to important anatomical landmarks and weigh the risks. Also being a diabetic, there is a higher risk of delayed healing.
I hope I opened your eyes to further discuss your risks and options with your endodntist before proceeding.

If you got to the aae.org website, you will find detailed explanation of the procedure with a video

The success rate depends on a lot of factors: patient health, oral hygiene, tooth position, reasons for failure, integrity of the root canal and restoration

Root canal success is affected by several factors like: speed of getting the permanent restoration within 2-3 weeks after root canal completion. Also if you grind or clench this could cause cracks in the tooth. If you don’t maintain excellent our hygiene, leakage could happen and lead to failure of root canal and reinfection.

Depending on the depth of the crack. If it involves the dentine, you will be sensitive to hot and cold liquids and food. It is best to see your dentist ASAP and avoid using this side until then.

You should see your dentist for cleaning, bitewing and exams every 6 months.

Retreatment or non-surgical treatment of a previously done root canal is a more involved procedure and requires the use of magnification to be able to remove the material placed in the canals and possibly locate missed canals. Root canal specialists usually perform their procedures under a microscope that allows magnification up to 20 times and have more specific instruments for more involved procedures that a general dentist usually does not have. I definitely recommend seeing a root canal specialist for all retreatments.