The aim of the study is to compare the clinical and radiographic outcomes of direct pulp capping for deep and extremely deep caries in mature permanent mandibular molars with reversible pulpitis. Primary objective of the study is to evaluate the clinical and radiographic success of direct pulp capping for deep and extremely deep caries in mature permanent mandibular molars with reversible pulpitis. Secondary objective of the study is to evaluate and compare postoperative pain following direct pulp capping for deep and extremely deep caries in mature permanent mandibular molars with reversible pulpitis. Subjects of age group 18 - 40 yrs will be included and divided into two groups 1) Permanent mature molars with deep carious lesion 2) Permanent mature molars with extremely deep carious lesion.