Dr Chelsia Sim is an Associate Consultant at National Dental Centre Singapore, in the Department of Oral Maxillofacial Surgery, specialising in Oral Medicine and Pathology. She is a Clinical Lecturer at the Faculty of Dentistry, National University of Singapore. Her clinical interests includes diagnosis and management of oral diseases such as autoimmune mucocutaneous diseases such as lichen planus, pemphigus and pemphigoid, recurrent stomatitis, Sjogren’s syndrome, oral diseases related to HIV and other infectious diseases. She also treats patients with head and neck cancer and precancerous lesions. In addition to her clinical practice, Dr Sim is actively engaged in the surgical biopsy service. Dr Sim is a diplomate of the American Board of Oral Medicine, a fellow of the American Academy of Oral Maxillofacial Pathology and she holds a Fellowship in Dental Surgery by the Royal College of Surgeons of Edinburg in oral medicine.