Introduction. Caries remains the most widely spread dental disease. Because of the low rate of addressability and late detection the carious lesions are mostly deep carious lesions. Frequently this leads to losing the tooth vitality. In order to maintain the tooth vitality, we can use the method of direct or indirect pulp capping.    Aim of the study. The aim of this study is to present a case of use of calcium hydroxide in a deep carious lesion.  Material and methods. A clinical study was performed on one patient with the clinical diagnosis: deep carious lesion. The patient was treated by the method of indirect pulp capping using calcium hydroxide.  Results. The usage of calcium hydroxide in deep carious lesions has proven to be a very good material, showed high biocompatibility. The treated tooth showed no post-operative sensibility and vitality of the tooth was preserved.  Conclusions. The usage of calcium hydroxide has a positive effect on new dentine bridge creation in order to maintain the tooth vitality. Moreover, it seems to facilitate the healing process and decrease the risk of postoperative complications.