Inclusion Criteria:  1-Non-vital primary molars  With root resorption more than 1 mm that needs to be retained a tooth for up to 12 months that otherwise would be extracted Without mobility up to grade I mobility.  Exclusion Criteria:  Non-vital primary molars  With perforation into the bifurcation. Badly broken down. With no root resorption. With excessive bone loss in furcation area involving underlying tooth germ. Nearing exfoliation.  Participants that  Have previous history of allergy to the antibiotics used in the study. Their caregivers do not oblige to signing the informed consent.