A method for treating a periodontal disease affecting a periodontal pocket of a patient. The method comprises inserting an oral delivery device into the periodontal pocket at a frequency of about once every 4 days to about once every 6 weeks. The oral delivery device is a controlled release solid unit dosage form suitable for insertion into a periodontal pocket of a patient, comprising a therapeutically effective amount of at least one anti-inflammatory agent, at least one antibacterial agent, or the combination of at least one anti-inflammatory agent and at least one antibacterial agent.