The masticatory performance of patients at the baseline, 1 month and 6 months later will be taken with a color-changeable gum, called "XYLITOL", (70x20x1 mm 3 g; Masticatory Performance Evaluating Gum XYLITOL, Lotte, Tokyo, Japan). Color changeable gum was first developed specifically to evaluate a person's masticatory performance; and it changes color as it is chewed. The gum will be chewed 60 times by the TMD patients. These values will be recorded and compared with the baseline, 1 month and 6 months later. After chewing, the gum colour will be evaluated according to the improved colour scale. Colour scale ranges from 1-10, and the masticatory performance will be evaluated as poor (1-6), normal (7-8), or good (9-10) with the improved color scale.

The nutritional status of patients at the baseline, 1 month, and 6 months later will be taken with 24-hour recall method. The data obtained from the 24-hour recall method will be analyzed using the "Computer Assisted Nutrition Program, Nutrition Information Systems Package Program (BEBIS)" and the amount of energy, carbohydrates, protein, fat and fiber consumed by participants will be calculated. Intake of energy, macro nutrients and fiber will be compared with the baseline, 1 month and 6 months later.

The body weight (kg) and height (m) of the patients at the baseline, and 6 months later will be taken by the researcher and noted in their files.

The height of patients will be taken using a stadiometer with the nearest 0.1 cm, while each participant is standing erect against the wall with heels together touching the wall, without shoes.

Body composition will be analyzed by Tanita DC-360 (Accurate Technology Co., Ltd. Tianjin, China) according to the standard procedure, and the body weight, percentage of body lean mass, and fat of the participants will be recorded. Body mass index (BMI) will be calculated using weight (in kilograms) divided by the height squared (in square meters).

Change in muscle pain intensity was assessed using a Visual Analogue Scale (VAS) ranging from the absence of pain (score 0) to the most severe pain imaginable. The VAS consist of a line which can be presented horizontally or vertically (10 cm long) with anchor points of "no pain" and "worst possible pain". The patient will be asked to put a mark on the line that best describe the pain severity. The patients' responses' will be recorded and scored according to the VAS scale. Than, the results will be compared with the baseline, 1 month and 6 months later.