Recently, the Er: YAG laser has attracted attention because of its possibility of cutting hard tissue with extremely small thermal injuries. In this paper, eight cases (thirteen teeth) of apicoectomy using Er: YAG laser are reported. All procedures were performed without using air turbin or electric drill. The advantages of Er: YAG laser application include: absence of uncomfortable vibration: less chance for contamination of the surgical site: and reduced risk of trauma of adjacent tissue compared with ordinary methods.