Dentists' opinions as to both need for and outcome of orthodontic trea
tment show wide variation. Within the profession there is an opportuni
ty to reduce subjective bias and standardise criteria by the use of oc
clusal indices. The results of this study demonstrate that a group of
dentists can easily be trained to record the Aesthetic and Dental Heal
th Components of the Index of Orthodontic Treatment Need and the PAR i
ndex to a satisfactory level.