Inclusion Criteria:  Medically healthy children Participants attending follow-up appointments Children having at least one primary molar tooth with deep dentin caries involving occluso proximal surfaces.  Tooth inclusion criteria:  Vital pulp with symptom-free or reversible pulpitis Presence of marginal ridge breakdown and accessible cavity with hand instruments, Presence of active cavitated carious lesion (Code 3 with Nyvad criteria for caries lesion activity and severity assessment- Nyvad et al., 1999) Absence of spontaneous or prolonged pain related with irreversible pulpitis Absence of fistula or abscess near the tooth Absence of pathological mobility Absence of pain on percussion Absence of pulp exposure Caries lesion located in ½ inner part of dentin radiographically Presence of sound dentin layer between the deepest part of the carious lesion and the pulp radiographically Absence of periapical or furcation pathologies on radiographs Absence of internal and external root resorption on radiographs More than ½ of root remaining  Exclusion Criteria:  Any systemic disease, physical or mental disorder Children or parents who doesn't accept to participate and sign the informed consent Clinical or radiographic signs of pulpal or peri-radicular pathology Caries cavity which cannot be accessible to hand instruments Physiological root resorption more than 1/2 of the root in primary molars