*2.1. Research Tools*

The SSD disorder assessment questionnaire consisted of 10 closed questions concerning the occurrence of symptoms related to the temporomandibular joints, masticatory muscles, and the cervical spine. A standardized DS-14 psychological questionnaire was carried out among all students (Type-D scale). The questionnaire consists of seven questions which concern the tendency to experience various negative emotions and seven concerning tendencies to refrain from expressing these emotions. To qualify as Type D, you must obtain a minimum of 10 points in each of the two dimensions i.e., NA and SI.
