To assess the knowledge and practice of preschool teachers of Namakkal district towards digit-sucking habits in children Material and Methods: The questionnaires distributed to 300 study participants included questions of knowledge of habit, their approach toward thumb-sucking habits in school children, and their willingness to refer children to dentists. A simple random sampling method was employed. A single examiner conducted the survey and evaluated the data, this was done to avoid inter-examiner bias. Descriptive statistics were obtained and presented in tables and graphs. Statistical analysis was performed to gain further insight into the practices of preschool teachers regarding digit-sucking habits in children, using SPSS software (Version 25). Results: Out of 300 who participated in the study 80.3% were aware of thumb sucking habit. Out of the total respondent teachers, 69.7% observed the habit in children and 64.3% noted abnormal features in the oral cavity. Fifty-three-point-three percent of preschool teachers were aware of the dentist's role in managing the thumb-sucking habit and its associated malocclusion. Conclusions: This study inferred that preschool teachers have brief knowledge and practice regarding digitsucking habits, and further programs should be provided to enhance their knowledge.