Autism disorder (AD) was first identified by Leo Kanner, an American child psychologist, in 1943..The oral hygiene of autistic patients has been found to be poorer than that of non-autistic patients.Some of the common oral conditions seen in patients with ASD are dental caries; periodontal diseases, in particular gingivitis and dental trauma. Other oral health problems seen in autistic children includes bruxism,oro-facial trauma,suft tissue injury. Preventive dental care like fluoride application,dentalsealents, preventive restorative treatment can be practiced to maintain a good oral hygiene.Oral hygiene maintenance and preventive dental treatment should be emphasized by the dental practioners.