Periodontal therapy. Animation showing the treatment of periodontitis, an inflammation of the tissue that surrounds and supports the teeth. This condition is caused by poor dental hygiene where the build up of dental plaque (bacterial biofilms, yellow) leads to swollen and sore gums. The removal of this plaque by dental scaling, also know as periodontal therapy, is effective in mild cases of the disease. In more severe cases surgical treatment will also be required.HD master is flattened onto a black background, as seen in this preview. The original file has a transparent alpha channel and is available as the HD master of clip K003 3755.