The individuals in the intervention group were asked to gargle with 5 ml black mulberry syrup three times a day after meals and wait average one minute in the mouth and then swallow, in addition to the standard practice of the clinic. According to the standard practice of the clinic, mucositis treatment was performed by nystatin and/or benzidamine hydrochloride to the patients with the request of the physician. The patients were followed for 15 days. The 15-day period is consistent with the duration of mucositis healing in the literature. Follow-up and evaluation of patients who were discharged early were performed by home visits and made a phone call everyday.

Standard procedures of the clinic were applied to control group. According to the standard practice of the clinic, mucositis treatment was performed by nystatin and/or benzidamine hydrochloride to the patients with the request of the physician. Follow-up and evaluation of patients who were discharged early were performed by home visits and made a phone call everyday.

The individuals in the intervention group gargled with 5 ml black mulberry syrup and waited average one minute and then swallow it.

Oral mucosa of patients were evaluated with The Oral Evaluation Guide by examining the patients mucous membrane with the help of light source and asking patients.

Oral Evaluation Guide: The guideline evaluates the changes of the oral mucosa in eight areas. In the evaluation of the guide, numerical expressions like 1, 2, 3 are used and the changes in voice, swallowing function, saliva, tongue, lips, mucous membranes, gums, teeth or prostheses are scored. When scoring, all scores from eight areas are collected and the Oral Mucosal Score (OMS) is calculated. The lowest possible score is 8 and the highest score is 24. As the score increases, intra-oral complaints and the severity of mucositis increase.

Severity of oral mucositis were evaluated with World Health Organization Oral Mucositis Scoring Index by examining the patients mucous membrane with the help of light source and asking patients.

World Health Organization Oral Mucositis Scoring Index: According to this index, the severity of oral mucositis is graded as grade 0; no mucositis, grade 1; mild, grade 2; moderate, grade 3-4; severe mucositis.