A periodontal medicament composition comprising povidone iodine, an agar carrier, and optionally a bio-compatible, radio-opaque salt, for treating periodontal disease is disclosed, along with a method for preparing the same. A method is also disclosed for delivering the periodontal medicament composition, while in a liquid state, into the periodontal pocket of a patient afflicted with periodontitis whereupon due to the unique properties of the agar carrier, it solidifies to the contours of the periodontal pocket to form a periodontal medicament implant for releasing the povidone iodine over a period of time. In addition, a prepackaged periodontal medicament delivery system for treating the periodontal disease is disclosed which comprises (i) a tubular dispensing apparatus for retaining and storing one or more treatment units of the periodontal medicament composition in a solid state, and for delivery of the composition after conversion to a liquid state to the periodontal pocket of a patient afflicted with the periodontal disease; and (ii) a funnel-shaped tubular device adapted for coupling with the dispensing apparatus to facilitate the delivery of the periodontal medicament composition into the periodontal pocket. For storage and shipping or transport, the tubular dispensing apparatus and funnel-shaped tubular device are packaged in a light-resistant container.