Human Phenotype Ontology id HP_0000689 (Dental malocclusion) refers to an abnormality of the occlusion, or alignment, of the teeth and the way the upper and lower teeth fit together, resulting in overcrowding of teeth or in abnormal bite patterns. Also known as: Bad bite, Bilateral crossbite, Bilateral crossbite malocclusion, Incorrect relation between upper and lower dental arches, Malalignment of upper and lower dental arches, Malocclusion, Malocclusion of teeth, Misalignment of upper and lower dental arches.