Temporomandibular joint arthrocentesis is a method of flushing out the synovial fluid that is currently performed by providing a double puncture to the upper joint space. The traditional 2-needle technique has some restrictions, such as the difficulty in performing it in the presence of intra-articular adherences and in the female patients, because the space is very small. The adoption of a single-needle for fluid injection might have some advantages with respect to the traditional 2-needle approach in terms of easily, time of execution and tolerability. We describe a single needle technique and we recommend the use.Hospital Israelita Albert Einstein and Post-graduate program (Oral and maxillofacial surgery) Araçatuba Dental School-UNESP, UNINOVE Medical and Dental School and Santo Amaro University-Dental Implants Post Graduate Program, Sao Paulo, BrazilHospital Israelita Albert Einstein, Hospital Estadual "José Pangella"-Vila Penteado-SUS/SP and Oral Diagnosis post graduate program, FOUSP, Sao Paulo, BrazilPrivate practice, São Paulo, BrazilDepartment of Oral and Maxillofacial Surgery, Mirandopolis Regional State Hospital SUS/SP, São Paulo, BrazilPost-graduate program (Oral and maxillofacial surgery) Araçatuba Dental School-UNESP