Changes of dental calculus prevalence
| Group | N | Base | 1 week | After 2 weeks | After 4 weeks | After 8 weeks | After 16 weeks | |
|---|---|---|---|---|---|---|---|---|
| E | 30 | n (%) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (3.3) | 13 (43.3) | 15 (50.0) |
| P | 30 | n (%) | 0 (0.0) | 0 (0.0) | 4 (13.3) | 11 (36.7) | 13 (43.3) | 17 (56.7) |
| N | 30 | n (%) | 0 (0.0) | 0 (0.0) | 1 (3.3) | 11 (36.7) | 16 (53.3) | 23 (76.7) |
E: experimental group, P: positive control group, N: negative control group.
