A fifty year old diabetic female with fever, cough with expectoration, dyspnoea, and sever toothache presented at our hospital for dental treatment. Owing to the patient’s medical history, she was referred to the medical cell, where she was evaluated further and was diagnosed with pneumonia. Upon microbiological examination of sputum samples, the organism isolated was R. dentocariosa, an oral commensal that can rarely cause pneumonia. This gram positive bacterium once suspected can be easily isolated, identified and treated. Only challenge lies in considering the bacterium as a potent pathogen, while treating uncontrolled diabetic cases, as there is a close association between hyperglycaemia and infections.