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World Health Organization (WHO) Oral Mucositis Scale (modified from [10])
| Grade 1 (mild) | Oral soreness, erythema |
|---|---|
| Grade 2 (moderate) | Erythema, ulcers, but oral intake not prevented |
| Grade 3 (severe) | Oral ulcers interfering with oral intake and requiring liquids only |
| Grade 4 (life-threatening) | Oral ulcers to the extent that oral alimentation is impossible |
