Along with the overall improvement of the dental medical level, the development of laser technology and the promotion of the concept of comfortable and minimally invasive treatment, the application of laser in dental treatment is becoming more and more extensive; and the design and updating of dental laser equipment also make the dental clinicians more convenient and efficient in the treatment and operation. Different lasers have different absorption characteristics and different effects on oral soft and hard tissues, so that they have their own advantages in the treatment of oral diseases. Therefore, when choosing laser treatment, the appropriate laser should be selected according to the type and degree of lesions in order to achieve the treatment purpose and avoid or reduce the side effects of laser. This paper presents a review on the application of laser in the field of oral cavity, introducing the application, advantages and development prospects of laser in oral mucosal disease, periodontal, endodontic and maxillofacial surgery.