Editing Toothache (section)

=====Periodontic-endodontic lesion=====
Apical abscesses can spread to involve periodontal pockets around a tooth, and periodontal pockets cause eventual pulp necrosis via accessory canals or the apical foramen at the bottom of the tooth. Such lesions are termed [[Combined periodontic-endodontic lesions|periodontic-endodontic lesion]]s, and they may be acutely painful, sharing similar signs and symptoms with a periodontal abscess, or they may cause mild pain or no pain at all if they are chronic and free-draining.<ref>{{cite journal|last=Singh|first=P|title=Endo-perio dilemma: a brief review.|journal=Dental Research Journal|date=Winter 2011|volume=8|issue=1|pages=39–47|pmid=22132014|pmc=3177380}}</ref> Successful root canal therapy is required before periodontal treatment is attempted.<ref name="Carranza11th"/>{{rp|49}} Generally, the long-term prognosis of perio-endo lesions is poor.