The core stabilization group. Participants in this group will be received core stabilization training, orofacial manuel therapy and conventional physiotherapy (Home exercise program and patient education) as treatment. The number of participants is planned to be 15.

The orofacial manuel therapy group. Participants in this group will be received orofacial manuel therapy and conventional physiotherapy (Home exercise program and patient education) as treatment. The number of participants is planned to be 15.

Participants in this group will be received only conventional physiotherapy (Home exercise program and patient education) as treatment. The number of participants is planned to be 15.

Core Stabilization training will be based on dynamic neuromuscular stabilization and consists of three stages. In the first session, it is to teach the simultaneous activation of the transversus abdominis, pelvic floor, multifidus and diaphragm muscles and to improve muscle coordination and proprioception in the entire spinal region. In the second and third phases, exercises will be made more intense to improve muscular endurance and stability. The difficulty of the exercises will be increased by working in different positions, using resistance bands, exercise balls and body weight, and adding movements to the extremities. A total of 10 sessions of treatment program will be applied to the patients for ten weeks, once a week.

The severity of pain in the orofacial region was evaluated using a Numeric Pain Scale (NPS). The patients were instructed to mark the level of pain felt during rest, clenching and maximum mouth opening on a 10-cm line ranging from 0 (no pain) to 10 (intolerable pain).

The algometer is a reliable instrument for measuring the sensitivity of the masticatory muscles. The measurement will be made at 8 points. A force (Newton in force) of 1 kg (weight in kilogram) per square centimeter (surface area in centimeter square) is applied to the patient for 3 seconds, and this is continued until the patient feels pain (weight and surface area will be combined to report Newton in kg/ cm2). The physiotherapist will passively support the individual's head with the other hand. This process will be repeated three times and the average value will be calculated.

Mouth opening, protrusion and right and left lateral deviation will be measured starting from 0 using a 15 cm ruler. Repeated measuring reduces the standard error of measurement, hence repeated measurements were also included in our study (three times) with the largest recorded range taken.

For facial asymmetry evaluation, the distance between the anterior notch of the chin and the mandible line will be measured with a tape measure.

Palpation Meter (PALM), (Salt Lake City, United Kingdom, USA) will be used for pelvic tilt evaluation. The Palpation Meter has an angle inclinometer and two 360-swivel arms, one of arms will be placed in the Spina iliaca Anterior Superior (SIAS) and the other in the Spina iliaca Posterior Superior (SIPS). In this position, the angle indicated by the inclinometer will be recorded as the pelvic tilt angle.

Finger-to-floor distance (EPZM) will be used for flexibility of lumbal extensor. In the EPZM test, individuals will stand on a stool and are asked to bend their torso forward to reach as far as possible with both hands without bending the knees. The distance between the stool level and the middle finger will be measured by the therapist and and this distance will be recorded in cm. The individual will be asked to repeat this movement three times and the highest value will be taken as the test score.