Dental Public Health in Action Improving access to dental care for vulnerable children; further development of the Back2School programme in 2013 D. Simons, N. Pearson, P. Evans, T. Wallace, M. Eke and D. Wright This paper describes a service evaluation of a dental treatment programme providing care to children not normally taken to the dentist. It explains the extension of the Back2School programme from the pilot phase and assesses if a mobile dental unit (MDU) can provide a high quality service. The public health competencies it illustrates include oral health improvement, developing and monitoring quality dental services, and collaborative working. Key words: access, mobile dental unit, vulnerable children, dental care, United Kingdom