If accumulates around the teeth over a period of time, periodontal disease may result.

If bacterial plague (a.k.a. dental plague) accumulates around the teeth over a period of time, periodontal disease may result.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]