The periodontal ligament is what supports the tooth by means of binding it to the bone.

The tissues involved are the gingiva, the attachment fibers (ligament or periodontal ligament) and the bone that supports the teeth.

The tissues involved are the gingiva, the attachment fibers (ligament or periodontal ligament) and the bone that supports the teeth.

The cheek tooth of a horse is very long and often the apical infection includes not only the tooth but also the periodontal ligament, surrounding bone and potentially sinuses.

This inflammation stimulates the Malassez epithelial rests, which are found in the periodontal ligament, resulting in the formation of a periapical granuloma that may be infected or sterile.

As a result, the dental practitioner is able to determine where the apex of the root canal is located by means of measuring the conductance between the thermoset resin based material and the oral mucosa and periodontal ligament.

The tooth-supporting tissues, bone, periodontal ligaments and gums are tissues that can move under pressure and the teeth supported by such tissues can therefore move too.