The HACEK group endocarditis are infrequent in general population. They usually develop subacute endocarditis with large vegetations, peripheral emboli, heart failure, requiring frequent valvular replacement. We report a clinical case of endocarditis caused by Actinobacillus actinomycetemcomitans (AA), without the typical findings of the HACEK group endocarditis and with a successful evolution with medical treatment.