This is the ValueSet that contains all the codes in Oral Cavity Area (http://hl7.org/fhir/us/dental-data-exchange/ValueSet/oral-cavity-area) and Oral Cavity Area (http://hl7.org/fhir/us/dental-data-exchange/ValueSet/oral-cavity-area). E.g. what you have to deal with if you get resources containing codes in either of them