Study aim: This study investigated the effect of postoperative 660 nm Low-Level Laser Therapy (LLLT) on the radiographic crestal bone loss of fresh socket implants. Design: This study is a double blind clinical trial with two arm parallel groups. Thirty patients were randomly divided into two groups: laser (intervention) and no-laser groups (control). Random allocation list was generated using randomization software . Each patient could just provide an area for implant treatment. Settings and conduct: This study was performed in Department of Maxillofacial Surgery of Islamic Azad University of Isfahan. Immediately after tooth extraction, the implant was inserted into the the tooth socket area in terms of the standard protocol. LLLT was immediately started after surgery, and was repeated for three times per week for 2 weeks. The operator was not blinded. All other contributors to the study were blinded. Participants/Inclusion and exclusion criteria: Inclusion Criteria Individuals referred to the Department of Oral and Maxillofacial Surgery, were treated with tooth extraction and implant placement, without inflammation or gingivitis, Healthy adults who are at least 18 years old, Sufficient bone density to receive the implant, Having at least 6 mm bucco-lingual ridge width at the site of implant placement. Exclusion criteria Pregnancy or lactation, using anticoagulants, systemic glucocorticoid therapies, acute oral infection, untreated or uncontrolled periodontal disease. Intervention groups: 660 nm LLLT was applied in this study along implants longitudinal axis to the member of laser group(intervention group). To implants in the no-laser group(control group), the laser did not shine. Main outcome variables: Bone quantification at the implant site was assessed using periapical intraoral radiograph and computerized software immediately after the surgery and also by passing 4 months from that.