Aim: To assess the knowledge, awareness and practice among dental practitioners regarding oral appliances in treatment of obstructive sleep apnea (OSA). Objective: The objective of this study is to analyse the knowledge, attitude, perception and practice among dentists in the city of Chennai regarding oral appliances in treatment of OSA and thus create awareness to ensure it’s early screening and proper treatment. Background: Obstructive sleep apnea (OSA) constitutes a major public health problem that affects the middle-aged population. The problems of snoring and obstructive sleep apnoea have received considerably increased public attention during the past10-15 years. Oral appliances are devices that can be used to treat mild or moderate Obstructive Sleep Apnea, as well as snoring. Oral appliances are known as: Mandibular Advancement Splints (MAS), Mandibular Advancement Devices (MAD), Mandibular Repositioning Appliances (MRA), or Tongue Retaining Devices (TRD) which hold your tongue in place to keep your airway open while asleep. This study aims to assess the knowledge and analyse the practice of dentists regarding OSA and its management. Reason: Management of OSA should be given more importance in the student’s curriculum as dentists often fail to recognise OSA as being related to dentistry and thus co-operating with physicians while treating OSA.