Workers in this unit group perform limited diagnostic, curative and preventive dental tasks within a public dental health service (e.g. for schoolchildren), or otherwise. Their theoretical and practical training in dentistry is less than that of Dentists (0-63).Dental prosthesis maker and repairer is classified in 8-42.50. Dental chair-side assistants (workers who help the dentist in his consulting room at the chairside by preparing and taking care of instruments and other dental equipment, preparing materials and looking after the welfare of patients) are classified in unit group 5-99.