This information is currently collected by a simple ‘Yes/No’ question and is not typically updated throughout the dentist’s tenure on the list.
Mae hyn oherwydd yr oedi cyn bod y data Arolwg Blynyddol o’r Boblogaeth diwygiedig, a oedd wedi’u hailbwysoli a’u gywiro ar gael oddi wrth yr Swyddfa Ystadegau Gwladol.