The primary tooth with caries process could be abscess and became non-vital inflammation of the pulp tissue extents into the root canals. An effort to maintain the non-vital primary teeth with fistula is
pulpectomy. The primary tooth pulpectomy is a common clinical procedure. The choice of filling material and antibacterial properties against organism to inhabit infected primary root canal is important. The choice of filling material is zinc oxide eugenol and antibacterial medicament is formocresol. One appointment formocresol pulpectomy procedure is indicated when inflammation of the pulp tissue
extend into the root canals, and possibly involves the periapical and/or bifurcation area. ln this case, after treatment with one-appointment formocresol pulpectomy in non-vital incisive lateral primary tooth with
fistula is successful in one and eight months. This procedure provides an alternative to extraction and space maintenance when the pediatric dentist encounters a non-vital primary tooth.