| Region | Brushing Habit/Times a Day | N of Cases | N of DMF | of DMF out of Total DMF | of DMF within Region | Amount of Decrease Rate | |
| West | 1 or 2 | 840 | 168 | 14.0 | 80.4 | 4.1 | |
| 3 or more | 168 | 41 | 3.4 | 19.6 | |||
| Total | 1008 | 209 | 17.4 | 100 | |||
| East | 1 or 2 | 392 | 78 | 6.5 | 86.7 | 6.5 | |
| 3 or more | 84 | 12 | 1.0 | 13.3 | |||
| Total | 476 | 90 | 7.5 | 100 | |||
| North | 1 or 2 | 1036 | 251 | 20.9 | 98.8 | 82.3 | |
| 3 or more | 56 | 3 | 0.2 | 1.2 | |||
| Total | 1092 | 254 | 21.1 | 100 | |||
| South | 1 or 2 | 812 | 172 | 14.3 | 93.5 | 14.4 | |
| 3 or more | 112 | 12 | 1.0 | 6.5 | |||
| Total | 924 | 184 | 15.3 | 100 | |||
| Center | 1 or 2 | 1792 | 384 | 32.0 | 82.8 | 4.8 | |
| 3 or more | 364 | 80 | 6.7 | 17.2 | |||
| Total | 2156 | 464 | 38.6 | 100 | |||
| Total | 1 or 2 | 4872 | 1053 | 87.7 | 87.7 | 7.1 | |
| 3 or more | 784 | 148 | 12.3 | 12.3 | |||
| Total | 5656 | 1201 | 100.0 | 100.0 | |||