Inspectors acknowledged improvements had been made since previous inspections, but highlighted that further changes were still needed, and people were waiting too long to be treated.
Gwnaeth arolygwyr gydnabod bod gwelliannau wedi'u gwneud ers arolygiadau blaenorol, ond amlygwyd bod angen newidiadau pellach o hyd, a bod pobl yn aros yn rhy hir i gael triniaeth.