<unk>  is relative underdevelopment of the<unk><unk> s.<unk>  tends to produce xerostomia (dry mouth), with all the associated problems this brings. It is a rare condition, which may occur as a congenital abnormality or result from lack of neuromuscular stimulation. It may be associated with Melkersson–Rosenthal syndrome, and hereditary ectodermal dysplasia.
Salivary gland hypoplasia
Salivary gland atresia
Salivary gland aplasia
Maxillary hypoplasia
Patulous Eustachian tube
Regional odontodysplasia
Persistent thyroglossal duct
Enamel hypoplasia