This research synthesis protocol addresses the question: what is the evidence concerning measurement properties of dental patient reported outcome measures (dPROMs), and regarding the real-world value of dPROMs, and where are the gaps in this evidence? Evidence mapping will systematically examine reviews of quantitative dPROMs used to assess the impact of oral health on the quality of life of dental patients and research participants. Evidence gaps where future research or systematic reviews are required will be identified. Materials and methods: This protocol accords with the PRISMA-P guideline. Open Science Framework Registration https://doi.org/10.17605/OSF.IO/RZD3N. Biomedical and grey literature databases will be searched, adapting the same search strategy. Published or unpublished reviews evaluating any dPROM will be considered for inclusion. There will be no restriction by date, setting, or language. AMSTAR2 and ROBIS will evaluate risk of bias. Psychometric criteria will be adapted from COSMIN. Data will be summarised separately for specific populations and conditions. Discussion The findings will enable clinicians and researchers to identify methodologically robust dPROMs, appropriate for use with relevant populations and conditions. Implications for real-world practice and research will be discussed.