There is a bad inheritance for concept 17552000|Dental calculus (disorder)|. It is due to the "associated morphology = calculus (morphologic abnormality" being in a separate hierarchy from the parent's "associated morphology = accretion (morphologic abnormality)". I was trying to fix this and wondered if "calculus" is really the correct morphologic abnormality to be using in the dental context. It seems to be a hardening of the plaque deposit and that maybe it would be better to add a new morphologic abnormality of "hardened plaque accretion" (FSN would need refinement) that would inherit under 10122001|Accretion (morphologic abnormality)|. If there is time perhaps this could be an agenda item.