Fig. 2

The frequency of functional tooth loss for each tooth position. The dentitions show the frequency of functional tooth loss in each tooth position among elderly people with functional tooth loss ≤12, 13–16, and > 16, from 0% in blue to 100% in red. a The heatmap summarizing the frequency of functional tooth loss in each position in three groups; and b-d the frequency of functional tooth loss in each position among people who lost ≤12, 13–16, and > 16 functional teeth, where the upper and lower panel shows the frequency of functional tooth loss in maxillary and mandibular jaws, and the middle panel shows the bar chart for the frequency of functional tooth loss in each tooth position