I also have severe toothache, I consult doctor he told to have root canal, but it was too expensive with out insurance. I was delaying for root canal. I used to get very severe pain, and was taking 4-5 powerful antibiotics and lot of Ibuprofen pills, still I have ache repeatedly after few days or weeks.
After seeing my agony my wife started praying for Jesus, and I also started praying . I got answer from Jesus. Next day I don't know why, but I took 3 table spoons of cooking oil and gargle it for 10 mins, again after some time 3 more spoons for 10 mins.
I never got that severe pain again. Some times I get minor ache, I gargle it goes thats all. Hope this will help you guys too....don't forget to pray Jesus, probably that is main the main part.