Factor Bleeding gums
N (%) 		Toothache
N (%) 		Biting difficulties
N (%) 		Number of
natural teeth
No Yes No Yes No Yes > 20 10 - 19 < 10
Toothbrush 7811 (96.5) 439 (92.4) 7166 (96.6) 1084 (93.9) 7959 (96.5) 291 (90.7) 6531 (97.8) 1174 (93.5) 541 (85.7)
χ2 test P-value < 0.001 < 0.001 < 0.001 < 0.001
Dental floss 2149 (26.5) 97 (20.4) 1986 (26.8) 260 (22.5) 2190 (26.5) 56 (17.4) 1968 (29.5) 231 (18.4) 44 (7)
χ2 test P-value 0.003 0.002 < 0.001 < 0.001

N = number of cases; χ2 = Chi-square.