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The inclusion of one or more teeth is a frequent pathology in the clinical practice. After the third molar, the canine is the most affected tooth (frequency between 0.92% and 4.3%). It is palatal in 54% of the cases, vestibular in 32% and median in 12% and, to know exactly its localisation, it is necessary to make several examinations going from the simple Panoramic Radiograph to TAC and RMN. While in the case of third molars the indication is the extraction, the importance of canines, premolars and incisors is so great that effort of the clinician must be finalized to preserve their integrity and to replace them into the dental arch. This procedure needs a strong cooperation between orthodontist and oral surgeon because the therapy comprises, after the period of the preparation of the space required and before the orthodontic alignment, also the surgical intervention. The periodontal outcome of surgically exposed and orthodontically extruded impacted teeth compared with the spontaneously erupted controlateral teeth indicates that orthodontic extrusion of impacted front teeth does not jeopardize their periodontal health and so the procedure appears to be a satisfactory alternative to extraction and/or transplantation, results indicating that the technique of surgical exposure and orthodontic alignment of ectopic teeth provides a satisfactory method of treatment. In particular, important deteriorative changes were observed only where the surgery had been more radical and where the tooth movement involved active alteration of root position suggesting that, in these cases, surgical procedures must be limited in scope and that the exposure of the cement enamel junction must be avoided. Use of laser technique in the treatment of this pathology gives several advantages. It allows making a very selective intervention, minimally invasive and respecting the periodontal tissue, and this is very positive related to the success of the therapy, particularly by the point of view of the soft tissues. The pain control is generally very good and, sometimes, anaesthetics injection is not required. Due to the biostimulating effect of laser, the healing process is fast and without discomfort. The greatest advantage is the complete absence of bleeding, which gives the possibility to immediately bond the bracket in dry enamel, so preventing the possibility of detach and reducing the risk of a further reintervention. While in the case of partial bone inclusion different wavelengths such CO2 (10600 nm), Nd:YAG (1064 nm), Diode (810 nm) and KTP (532 nm) may be utilised, when the tooth is totally retained in the bone, Er:YAG (2940 nm) is required, in order to ablate the hard tissue. DIFFERENT LASER WAVELENGTHS IN THE ORTHODONTIC SURGERY OF THE RETAINED TEETH