Radiation Therapy Oncology Group assessment scale of the effects of radiotherapy on oral mucositis
| Grade | Sign/symptom |
| 0 | No reaction |
| 1 | Mild erythema, dry desquamation, epilation, decreased sweating |
| 2 | Moderate erythema, glossy exudative plaque dermatitis and moderate oedema |
| 3 | Exudative dermatitis in addition to skin folds, severe oedema |
| 4 | Ulceration, haemorrhage, necrosis |