Hypodontia-nail dysplasia syndrome is a form of ectodermal dysplasia. The disease is MONDO_0008582 (tooth and nail syndrome). Also known as: HND, Witkop syndrome, Witkop's syndrome, hypodontia and nail dysplasia, hypodontia with nail dysplasia, hypodontia-nail dysgenesis syndrome, hypodontia-nail dysplasia, hypoplastic enamel-onycholysis-hypohidrosis syndrome.