Cwm Taf Morgannwg has the highest number of Welsh speaking dentists per 10,000 Welsh speakers at 6.8, while Aneurin Bevan has the lowest at 1.1.
Hefyd, mae gan Gwm Taf Morgannwg y nifer uchaf o ddeintyddion sy’n siarad Cymraeg am bob 10,000 o bobl sef 0.7, gyda’r un nifer ym Betsi Cadwaladr; ac Aneurin Bevan sydd â’r isaf ar 0.1.