Periodontics is the dental specialty focusing exclusively in inflammatory disease that destroys the gums and other supporting structures around the teeth. A periodontist is a dentist who specialises in the prevention, diagnosis, and treatment of periodontal disease, and in the placement of dental implants. A general dentist is expected to have certain skills and knowledge similar to a periodontist; however, when the problem has progressed and becomes more complex, a dentist often refers the patient to the periodontist. Periodontists work closely with radiology technicians, general dentists, and other specialists.