Variation of Energy in Photobiomodulation for the Control of Radiotherapy-Induced Oral Mucositis: A Clinical Study in Head and Neck Cancer Patients

Table 2

Classification of oral mucositis (adapted from WHO [17]).

Score	Severity	Typical manifestation
0	None	None (no signs or symptoms).
1	Mild	Oral soreness and erythema.
2	Moderate	Oral erythema and ulcers, both solid and liquid diets tolerated.
3	Severe	Oral ulcers, requires liquid diet only.
4	Life-threatening	Oral alimentation not possible.