Cui X, et al. - Authors evaluated the modifiable patient risk factors from dental chart histories and radiographs for progressive mild-moderate periodontitis during periodontal maintenance (PM). They took bitewing radiographs of 442 elderly periodontal maintenance patients before and after two years of periodontal maintenance. Findings suggested, in the short term, a limited value of systemic and behavior factors in identifying mild-moderate periodontitis patients on PM at increased risk of bone loss. Nonetheless, they noted the correlation of interproximal width and lack of adjacent tooth contacts with the likelihood of losing interproximal bone during periodontal maintenance, suggesting the need for restorative therapy.