This pain is often similar to pain from organic dental disease such as periapical periodontitis, or pulpitis (toothache), but unlike normal dental pain, it is not relieved in the long term by dental treatments such as endodontic therapy (root canal treatment) or tooth extraction, and it may even be worsened, return soon after, or simply migrate to other areas in the mouth following dental treatment. Definitions
Atypical facial pain
There is no universally accepted definition of AFP, and it is defined less by what it is as what it is not. Various definitions of AFP include:

"a nonmuscular or joint pain that has no detectable neurologic cause." "a condition characterized by the absence of other diagnoses and causing continuous, variable-intensity, migrating, nagging, deep, and diffuse pain." "a continuous unilateral deep aching pain sometimes with a burning component." "facial pain not fulfilling other criteria" (previous IHS definition, which now uses the term "Persistent idiopathic facial pain", see below). "persistent pain in the maxillofacial region that does not fit the diagnostic criteria of any other orofacial pain and has no identifiable cause." (Neville et al.) Atypical odontalgia
There are no globally accepted definitions of AO, but some suggested definitions are listed below:

"continuous pain in the teeth or in a tooth socket after extraction in the absence of any identifiable dental cause," (International headache society, description included as a side note of "persistent idiopathic facial pain" in the ICHD-2, i.e. with is no separate diagnosis for atypical odontalgia).
There may be genetic causes in some cases, and there may be environmental factors to which the mother is exposed during pregnancy.Risk factors include the mother being young, and use of alcohol or tobacco. Pathophysiology
During the fourth week of human embryonic development, the lateral body wall folds of the embryo meet at the midline and fuse together to form the anterior body wall. However, in gastroschisis and other anterior body wall defects, this fails to occur by either one or both of the lateral body wall folds not moving properly to meet with the other and fusing together. This incomplete fusion results in a defect that allows abdominal organs to protrude through the abdominal wall, and the intestines typically herniate through the rectus abdominis muscle, lying to the right of the umbilicus.