Mandibular fracture is the most common facial fractures and it is an important surgical condition in the world. Aims of the study; assess patients' knowledge about nutrition, oral care and jaw exercises, design, implement and evaluate the effect of suggested nursing teaching protocol on patients' outcomes with mandibular fracture. Research design; A quasi-experimental research design was utilized on a convenient sample of 60 adult patients divided into two equal groups (study and control) 30 patients for each. Tools; I) Patient with mandibular fracture an interview schedule. II) Patient assessment schedule. Results; There was statistically significant difference between study and control groups post implementing nursing teaching protocol as regard knowledge level of patients about nutrition, oral care, and jaw exercises. There was statistically significant difference between study and control group as regards late complications. Conclusion; Patients' knowledge regarding nutrition, oral hygiene and jaw exercises were inadequate. So a specialized nursing teaching protocol was designed, implemented and evaluated. Study group showed improvement in wound healing, maintain normal body weight and decreased incidence of complications while control group showed increase incidence of these complications. Recommendations; Simple illustration booklets should be available for patients to provide them with simple explanation about safely living.