Your tooth is composed of several layers. The outside of a tooth is a hard crystalline material called enamel. Underneath this hard layer is a slightly softer layer called dentine. Below the dentine is a soft tissue called the dental pulp. The pulp contains blood vessels, nerves and connective tissue, and helps to grow the root of your tooth during development and continues to provide nutrients during life. Deep cavity or an injury can kill the pulp. This can cause infection, severe pain, and bone degeneration. Root Canal procedure can save the tooth. During root canal treatment, the inflamed or infected pulp is meticulously removed and the inside of the tooth is carefully cleaned, disinfected and shaped to allow a root filling to be placed. The root canal is filled and sealed. Afterwards, the tooth is often restored with a crown or filling for protection. Teeth which have had root canal treatment are around six times more likely to fracture so almost always a crown is recommended especially on back teeth.