Periodontal disease video1970-01-01T00:00:00+00:00External anatomy of tooth and stages of periodontitis, video animation. PT30Shttps://d38zjy0x98992m.cloudfront.net/185194a0-067b-11e3-a540-038465cc3d8c/tooth_periodontal_xlarge.jpghttps://d38zjy0x98992m.cloudfront.net/185194a0-067b-11e3-a540-038465cc3d8c/tooth_periodontal_mp4_hd_video.mp4