This is a randomized, controlled, double-blind clinical trial. The main objective is to evaluate the immediate effect of the mandibular muscle-energy technique on pain, functionality and kinesiophobia in subjects suffering from temporomandibular dysfunction and bruxism.

In the experimental group the jaw muscle-energy technique will be applied and in the control group a placebo technique will be applied. The intention is to see the immediate effects of the intervention and two evaluations of the pre- and post-intervention outcome variables and a follow-up of kinesiophobia one week later will be performed.

Inclusion Criteria:

• Patients who agree to participate in the study by signing the informed consent form.
• Patients attending maxillofacial consultation with pain, temporomandibular dysfunction and bruxism.
• Pain of at least 3 months of evolution.

Exclusion Criteria:

• Patients with congenital malformations or cervical spine pathology.
• Infectious or inflammatory disease in its acute phase.
• Patients with vertigo or vestibular alterations.
• If there is a contraindication to the technique or phobia on the part of the patient.
• Physiotherapy treatment (manual therapy or electrotherapy) in the last month before their incorporation in the study.
• Pharmacological treatment (analgesics, relaxants and anti-inflammatory drugs) in the last 24 hours before the initial evaluation.

The participants will be blinded because in both groups they were following the treatment and medical recommendations and they will also be attended by a physiotherapist, in one case the mandibular muscular energy technique will be performed and in the other the placebo technique.

The evaluators did not know to which group the participants belonged.