Periodontal disease is one of the most painful conditions that can occur in the horse’s mouth and is the number one cause of premature tooth loss in adult horses, potentially able to affect incisors, canine teeth, and cheek teeth.
The disease is characterised by inflammation of the structures that support the tooth (including the gum, periodontal ligaments and the bone within which the tooth sits). It can occur secondary to missing teeth, diastemata (gaps between teeth) or calculus (plaque) on the teeth amongst other things. The normal tight seal between the tooth and surrounding soft tissues is lost allowing food material to become trapped in the gap. This sets up an infection and causes further recession of the gum. This cycle can eventually lead to infection tracking along the edge of the tooth down to the root or into the jawbone.
In severe cases, the tooth may become loose or fall out, obviously causing significant pain in the process.