Good communication skills are an essential attribute for practising dental practitioners working in the Australian Community. English language proficiency is one aspect of good communication in the clinical practice context.
You are not required to provide evidence of English language proficiency prior to sitting ether the ADC Written or Practical Examinations.
English language proficiency requirements for registration are available on the Australian Health Practitioner Regulation Agency website at https://www.ahpra.gov.au/
English language proficiency requirements for migration are available on the Australian Department of Immigration and Boarder Protection website at http://www.border.gov.au/