Changes in Tooth Yellowness with Age in a UK Practice-Based Population

Kate Mckenzie, Iain Pretty, Michaela Goodwin, Nicola Boothman, Ravi Singh

Research output: Contribution to conferencePosterpeer-review


Objectives: To investigate the relationship between tooth yellowing in relation to age in a UK practicebased population. Methods: As part of a larger study that considered changes in overall tooth color with age. The upper right central incisor of 658 subjects, in age cohorts of 7-10, 11-17, 18-25, 26-35, 36-45, 46-55, 56-65 and >65 years was measured with the Vita EasyShade tooth color measurement device. From this device CieLab values were reported and subsequently perceptual yellowness values were calculated using a new yellowness equation optimised for tooth color (YIO). The relationship between age and tooth yellowness was tested using a linear regression model. Data are reported for b* (blue-yellow vector of CieLab) and YIO. Results: As previously reported the youngest subjects’ teeth became lighter (0.5 BG shades) for all metrics including YIO up to the age of around 18 years and then became increasingly darker. For this reason, the slope of the relationship between age and yellowness was evaluated in those subjects 18 years and above (n=526). For b* and YIO, the slopes of the regression were 0.133 and 0.914 respectively representing 7.5 and 1.1 years per unit change for each metric. Conclusions: Teeth become linearly perceptually yellower with age above the age of 18 years. A single unit change in YIO representing 1.1 years.
Original languageEnglish
Publication statusPublished - 3 Sept 2019
EventBritish Society for Oral and Dental Research: Annual Meeting - School of Dentistry, University of Leeds, Leeds, United Kingdom
Duration: 3 Sept 20195 Sept 2019


ConferenceBritish Society for Oral and Dental Research
Abbreviated titleBSODR
Country/TerritoryUnited Kingdom
Internet address


  • epidemiology
  • tooth shade
  • yellowness


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