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Here is a summary of the tooth/teeth issue, which can be found at (https://jira.ihtsdotools.org/browse/IHTSDO-238)

Submitter suggested to change the FSN of Supernumerary permanent teeth (disorder) to Supernumerary permanent tooth (disorder).
The concept Supernumerary permanent teeth (disorder) was not renamed to include the singular tooth in the FSN because it is not entirely clear when “teeth” in FSNs is intended to necessarily represent multiples.
There are about 180 (note this is now

267) active concepts with teeth in their FSNs. These could be reviewed as to whether some of these FSNs should be changed to “tooth” or whether these concepts truly pertain to “multiple teeth”. Although “teeth” by definition means more than one, it is not clear that all FSNs that refer to “teeth” necessarily were intended to mean more that one tooth (e.g. Erosion of teeth (disorder) has description “Tooth erosion”).
One option would be to assume that “tooth” means “tooth or teeth”. In that case, “single tooth” should be used in FSNs to represent “one tooth” (e.g. SNOMED CT has Supernumerary tooth (disorder) and Single supernumerary tooth (disorder)). Concepts with “teeth” in their FSNs could then be reviewed to determine which concepts necessarily mean more than one tooth (e.g. Crowding of teeth (disorder)) and where the use of “teeth” might create ambiguity (e.g. Supernumerary permanent teeth (disorder) and Erosion of teeth (disorder)). If it is decided that “teeth” in an FSN necessarily implies multiple teeth, then concepts with “teeth” in their FSNs should not have “tooth” subtypes.

And Jorn's request:

The concept is a mix of singular (tooth) and plural (teeth), but has children separating singular and plural. Children are also a mix of specification of one/many and cause of loss. Uncertain of how this should be solved. Suggest discussion in SIG.