Introduction All dental service delivery organisations and their workforce need to adopt more efficient and effective delivery models including increased skill-mix.Aim The aim of this study was to investigate the possible barriers/benefits to the utilisation of dental therapists (DTs) in the UK Military Dental Service.Method An explanatory mixed-methods study of sequential design was conducted using purposive sampling of dentists and DTs in the Defence Military Service. Electronic questionnaires (25) were sent to dentists and DTs with an overall response rate of 80% (15/18 dentists and 6/7 DTs). Following analysis of the questionnaires, seven semi-structured interviews (four dentists, three DTs) were thematically analysed.Results All dentists and DTs agreed that DTs could play a positive role within the Defence Military Service, but the barriers and benefits of their use centred on the six main themes of: leadership, delegation, new ways of working, scope of practice, skill-mix and utilisation.Conclusions To address the barriers and maximise the benefits of using DTs, effective leadership at the organisational, dental centre and individual levels is required. This leadership is key to unlocking the benefits of improved teamwork, increased skill-mix and maximised use of all dental care professionals within the Defence Military Service.