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| degree | cytotoxicity | cytotoxicity zone |
|---|---|---|
| 0 | absence | absence of bleaching under the sample |
| 1 | light | bleaching zone limited to the area under the sample |
| 2 | mild | bleaching zone from the sample up to 0.5 cm |
| 3 | moderate | bleaching zone from the sample between 0.5 to 1.0 cm |
| 4 | severe | bleaching zone greater than 1.0 cm |
