This type of surgery is done in severely infected teeth that do not respond to traditional techniques such as root canal treatment. It is a minor surgical procedure done under local anesthesia, hence it is painless.
The surgery involves accessing the root of the tooth beneath the gums. The diseased bone and tooth tissue is removed and the tooth root end is sealed with a filling material. Bone graft is also placed occasionally to speeden up the wound healing. You may require stitches after the surgery, and antibiotics and painkillers for a few days. However, since it is a minor surgical procedure you can resume work the next day itself.