Is it normal that I still have severe pain 12 days after Bone Graft surgery?

I had bone graft surgery in my lower left for 2 missing teeth and the dentist used bone bank for the surgery. I was prescribed antibiotic and pain killers. However, It has been 12 days and the pain doesn't seem to alleviate. I went back to the dentist 8 days after the surgery to check if there are any problems and he said that it's healing well. I'm still having lots of pain after 12 days and the pain killers are not as effective as they initially were. I'm not sure if this normal.