Pulpotomy has become one of the most important pulp therapy in caries treatment of deciduous teeth. Since the introduction of formocresol by Buckley, formocresol pulpotomy has been widely used in the field of pedodontics. Neotriozinc paste (10% paraformaldehyde), which is similer formuration to formocresol, was used as a mummifying paste. Roentgenographic and clinical examination were carried out to 121 deciduous teeth during periods of 41 days to 380 days. As a result, 99 cases (81.8%) were favorable and 22 cases (18.2%) were unfavorable.