However, this type of dry and hard mucus is not entirely abnormal even though uncommon.
[phaa.com]
[…] body tissue such as teeth, sequestra, mucus, bone, or blood clot. [1], [2], [3] Most of these are introduced through anterior nares, although some foreign bodies have been
[ijdr.in]
During odontogenesis, any abnormal developmental tissue interaction may result in tooth ectopy.
[jemds.com]