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WHO grading system for Oral mucositis severity
| Grade | Description |
|---|---|
| Grade 0 | None |
| Grade I | Mild mucositis: oral soreness and/or erythema |
| Grade II | moderate mucositis: oral erythema, ulcers, and solid diet can be tolerated |
| Grade III | severe mucositis: oral ulcers, but solid diet cannot be tolerated |
| Grade IV | life-threatening: oral alimentation is impossible |
