sentences:  Their role was eliminated by the Dentist Act of 1921 because of hostility to the role on the part of the dentist profession.They were later re-introduced, on the strength of the New Zealand scheme, as dental therapists when the high dental needs of children were 'rediscovered' in the 1960s, carrying out similar services but under the prescription of a dentist who carried out the examination and care plan.The success of New Zealand's program was so significant that many countries facing similar needs adopted programs which mirrored the ones initially established in New Zealand.