This is the first randomised clinical trial evaluating e-cigarettes and oral health world-wide. Several dental practitioners from the north east acted as ‘Participant Identification Centers’ for this study and helped it recruit to target. The study finished data collection in June 2018. A newsletter from September 2018 can be viewed here- Participant Newsletter-Sept 2018. The full study has been published in the open access Pilot and Feasibility Studies Journal and is available here: https://doi.org/10.1186/s40814-019-0451-4