Autism is a neurological developmental disorder characterized by impaired social interaction, speech, and limited, repetitive behaviour . The cause of autism is not known . Autism risk factors include gender, males are three to four times more likely than females to get autism, family history, age of parents, and other disorders such as fragile, tuberous syndrome. Most of the autism work is conducted in high income countries. Therefore this study was conducted to check the knowledge of dental students regarding autism. This is a cross sectional survey was conducted among dental students through a self administrated questionnaire through an online survey link (I.e.) google forms . The responses were collected and statistically analysed. Chi square test was used to analyze and compare the education level of students and their knowledge on toothbrushes and it‟s replacement .The data was represented as pie Charts and bar graphs . The survey was conducted among dental students within the age group of 17 to 23 years. This survey was responded by 56.4 percent of females and 42.9 percent of males among them 91.7 percent of the people were aware of autism and only a few people were not aware of it. In this study we conclude that most of the dental students are aware of autism and they have sufficient knowledge about it.