Kemoterapi menjadi salah satu jenis pengobatan kanker anak. Mukositis oral merupakan gangguan kesehatan mulut paling lazim akibat kemoterapi. Pengetahuan orang tua tentang perawatan mulut sangat diperlukan untuk mencegah mukositis oral. Penelitian ini bertujuan untuk mengetahui hubungan pengetahuan orang tua tentang perawatan mulut dengan kejadian mukositis oral. Desain penelitian cross sectional dengan sampel 56 orang tua dan pasien anak yang dipilih dengan teknik purposive sampling. Alat ukur berupa Oral Assessment Guide (OAG) dan kuesioner pengetahuan perawatan mulut. Analisis data menggunakan Chi-square. Penelitian ini menunjukkan gambaran pengetahuan orang tua tentang perawatan mulut kurang (58.9%) dan kejadian mukositis oral sebanyak (28.6%). Uji statistik menunjukkan tidak adanya hubungan bermakna antara pengetahuan orang tua tentang perawatan mulut dengan kejadian mukositis oral (p=1.00). Hasil penelitian ini merekomendasikan perlunya peningkatan pengetahuan orang tua tentang berkumur dan penggunaan instrumen OAG untuk mendeteksi dini kejadian mukositis oral di ruang rawat.

---

Chemotherapy is a type of childhood cancer treatment. Oral mucositis is the most common oral health disorder due to chemotherapy. Parents' knowledge about oral care is needed to prevent oral mucositis. This study aims to determine the relationship between parental knowledge about oral care and the incidence of oral mucositis. The study design was cross sectional with a sample of 56 parents and pediatric patients selected by purposive sampling technique. Measuring tools in the form of Oral Assessment Guide (OAG) and oral care knowledge questionnaire. Data analysis using Chi-square. This study shows that parents' knowledge about oral care is lacking (58.9%) and the incidence of oral mucositis was (28.6%). Statistical tests showed that there was no significant relationship between parents' knowledge about oral care and the incidence of oral mucositis (p=1.00). The results of this study recommend the need to increase parental knowledge about gargling and the use of OAG instruments to detect early occurrence of oral mucositis in the ward.