text: elaborate on the 3 degrees of tooth mobility? in human deciduous/baby teeth.  i know 1 is the least mobile, and 3 is the most mobile, but can someone elaborate? here goes... hope this helps! mild periodontitis aka class i mobility  inflammation will spread to the supporting alveolar bone. minor bone loss and the formation of periodontal pockets, or food traps, may occur.     moderate periodontitis aka class ii mobility  in this stage, there will be increased gingival recession, moderate to deep pockets, moderate to severe bone loss, and mobility of teeth due to the bone loss.     severe periodontitis aka class iii mobility  this is the most serious stage of periodontitis. deep pockets, increased mobility of teeth, movement of teeth out of position, and visible fistulas (boils) will be present in this stage. pus may develop; bone loss continues, and your teeth may loosen or fall out.