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Number of teeth in need for periodontal treatment (PPD ≥ 4 mm). Estimates are based on imputed full‐mouth numbers of teeth. Edentate individuals are included. (a) Mean number of teeth with treatment need in different age groups between 1997 and 2030. (b) Mean number of teeth with treatment need at different ages in different years between 1997 and 2030. (c) The cumulative number of teeth (in millions) with treatment need between 1997 and 2030
