I had an impacted wisdom tooth pulled many years ago. The pain continued for weeks after the operation. The dentist cut me open again and looked but could not find anything.
It took him cutting me open three times until he found a small piece of tooth that had cracked and was still in the gum. He removed it and the pain finally stopped.
Anything we do that is in any way deceitful, dishonest or simply wrong in any way, regardless of our intentions, since of course with self lying we will not see our true intentions anyway, anything deceitful is a piece of bone that will cause us pain until it is removed.