Objective. Assess headache and bruxism in Craniomandibular Disorders (CMDs) and non CMDs patients. Method. Clinical examination, questionnaires, headache criteria, severity of bruxism. Results. The prevalence of headache was 68.3% in the CMDs group and 51.4% in the non-CMDs group (p<0.04).Tension type (TTH)=52.8% and combination headaches=25.2% predominated in CMDs. Migraine was more prevalent in Non-CMDs (21.1%) than in CMDs subjects (11.4%). Severe bruxism predominated in the headache/CMDs group=35% as compared to the non-headache/ CMDs group=21%, (p=0.08). We found a frequency of 29.3% extreme bruxism in the headache group and 7% in the non-headache group (p<0.0005). The frequencies of mild/moderate bruxism were about 28% in the TTH, 44.8% in the "other headaches" and 72% in the non-headache/CMDs groups. The frequencies of severe/extreme bruxism were 72.3% in the TTH, 55.2% in the "Other headaches", and 28% in the non- headache/CMDs groups(p=0.0001). Conclusion. Headache, TTH and combination headache were common in the CMDs group. Severe and extreme bruxism were more prevalent in the headache /CMDs group than in the "other headaches" and in the non/headache CMDs groups. 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