Context: Trismus is a tonic contraction of the muscles of mastication resulting from any abnormal condition or disease with mouth opening of ≤35 mm. Maxillofacial surgeries cause  fibrosis and subsequent scar contracture in the muscles of mastication that lead to a detrimental impact on quality of life; difficulty in activities such as biting, chewing, swallowing.
Aim:The studyaims to assess the effects of TheraBite Jaw Rehabilitation System on trisums post maxillofacial surgeries.
Methods: A convenience sample of 20 patients attended to maxillofacial clinic; they suffer from trismus post maxillofacial surgeries. Patients trained of using TheraBite Jaw Rehabilitation for one month. The outcome measured every week by using TheraBite scale of Mouth range of motion, Eat-10 assessment scale and visual analogue scale.
Results: There was improvement of mouth opening (MO) after regular use of TheraBite Jaw Rehabilitation, improvement of score of Eat-10 assessment scale, and decrease of pain dramatically.
Conclusion: Patients suffer from trismus exhibit an improvement of moth opening, score EAT-10 and decrease pain.
Recommendation:Applying educational sessions by nurses for patients to early use of TheraBit Jaw rehabilitation system post maxillofacial surgeries.