letdown (oh) and dentinogenesis imperfecta (medicine)

letdown (oh)

informal an event, performance etc that is not as good as you expected it to be
-synonym disappointment disappointment
::The end of the book was a real letdown.
-see also let down at let 1

dentinogenesis imperfecta (medicine)

dentinogenesis imperfecta

An autosomal dominant disorder of tooth development characterised by opalescent dentin resulting in discoloration of the teeth, ranging from dusky blue to brownish. The dentin is poorly formed with an abnormally low mineral content; the pulp canal is obliterated, but the enamel is normal. The teeth usually wear down rapidly, leaving short, brown stumps.

Sites

Pest Star