Children usually have difficulty of pronunciation, eating and swallowing due to abnormal labial or lingual frenum. Sometimes these structures may also in uence dental aesthetics and postures. So we use frenectomy to solve these problems. However, there are some complications of the traditional frenectomy, such as large operation fields or postoperative pain. Because of that, the laser frenectomy was developed. In our case reports, the diode laser frenectomy has the benefits of hemostasis, reducing pain and short treatment time. We also expect there are more applications of diode laser can be used in the future.