I just had what I think was root canal and had a temporary crown put in...my side of my tongue burns when I eat anything and my gum is sore near the spot where it was drilled ...what is wrong here also,I noticed under my tongue there is a white spot,and I have a small blister on the tip of my tongue..it is very hard to eat anything.
Thanks for your query, I have gone through your query. The burning sensation over the tongue could be because of any ulcer secondary to trauma during RCT or following anesthesia you might have bitten on tongue. Or it can be a burn secondary to the use of solutions like HY Chat Doctor.  Nothing to worry, you can use topical anesthetic and analgesics like Anabel gel 3-4times daily for 5 days. If it doesn't subside then consult an oral physician.  I hope my answer will help you, take care.