The floor cover of forklift is a kind of jaw deformity in maxillofacial region, which is called mandibular protrusion in medicine. The normal occlusal relationship is that the maxillary teeth cover the mandibular teeth, that is, from the front teeth, the maxillary teeth are outside the mandibular front teeth.

If there is a floor cover, that is, the mandibular teeth cover the maxillary teeth, the mandibular anterior teeth are located outside the maxillary anterior teeth in the anterior teeth area, which is a deformity.