Abstract
Abstract: The purpose of this study was to analyze and determine the extent of the prevalence of nail-biting habit among school kids and to determine its relationship to dental health. The study was conducted from the age of 9-18 years old and it consisted of questionnaire included name, age, gender, school year, class, place of residence of the student, educational level, the delivery of the student to school by his parents or alone, the number of fingers that are being bitten, and the health statue of the mouth. The incidence of nail biting in Tripoli Libya , was most were boys at a rate of 59.5%, and the highest percentage was in the age of 9- 12, at a rate of 51.7%, and the highest percentage in the academic level was excellent at 47%. These cases are not hereditary, with a percentage of 85.5%, and the use of both hands by 65.68%, and the biting of the ten fingers by 54.68%. while due to boring by 69.2% case detection there were 45.5% caries cases. Most of them are in milk teeth, with a rate of 54.83%. Conclusion, Nail biting can be a chronic and debilitating habit that may continue into adulthood and can be a source of disease, but it can contribute to severe psychosocial distress. In such cases, we need to educate people, stimulate good habits, and develop awareness when thinking that When considering that nail biting can transmit deadly disease, breaking this habit can be lifesaving.