The word endodontic is made up of two Latin words “endo” meaning inside and “odont” meaning tooth. Endodontics is the study and care of the inner parts of teeth. Teeth are composed of three layers. The outer layer is made up of tooth enamel, the hardest substance in the body. Inside the enamel, is a dense, supportive layer of dentin. The innermost layer of teeth is known as pulp and it houses the nerve and blood supply of the tooth. The job of an endodontist is to understand and treat oral health concerns that effect these inner layers and may lead to toothaches.