Table 1 Treatment groups for study of the effects of bleach on the histological appearance of cementum
| Treatment group | Treatment |
|---|---|
| 1 | None - control group |
| 2 | Soaked in 4% bleach for 5 min then rinsed |
| 3 | Soaked in 4% bleach for 1 min then rinsed |
| 4 | Soaked in 2% bleach for 5 min then rinsed |
