The treatment depends on the amount of tooth structure lost. If it is half broken, it will most probably go for a root canal, after which you have to get a crown (cap) done to make your broken tooth normal. If the tooth structure is too less to support a crown, then we also need to place a Post in the tooth.
Next Steps
Get it assessed at the earliest.
Health Tips
How did your tooth break? If it happened because of an accident or trauma, then get the adjacent teeth assessed as well. It will also help to get the tooth assessed once every 6 months because in some cases, infections as seen at the tip of the roots which have been traumatized.