The probability of getting oral cancer from eating betel nut cannot be determined, but it is certain that eating betel nut is one of the most important risk factors for oral cancer. Oral cancer is a malignant tumor caused by malignant lesions of squamous cells in the oral mucosa, which can be classified into various types such as tongue cancer, floor of mouth cancer and gum cancer. Although the cause of oral cancer has not been fully clarified, WHO classified betel nut as a class I carcinogen, and epidemiological studies have found that there is a close relationship between the onset of oral cancer and betel nut consumption. Although there is still a lack of large sample data on the probability of getting oral cancer from eating betel nut, it is certain that eating betel nut itself is a risk factor for oral cancer and should be avoided. Oral cancer is caused by a combination of various factors over a long period of time, therefore, it is important to pay attention to good oral care and health care in daily life. If you find any abnormal lesions in your mouth, you should consult a doctor in time.