 A direct pulp capping consists of covering an exposed tooth pulp the inside portion of the tooth where the blood vessels and nerve supply the tooth with a medication to maintain tooth vitality. Different events can cause the pulp to be exposed, for example a deep cavity, or an accident where the outer portion of the tooth fractures. When this occurs, it is sometimes possible to place a medicine over the top of the exposure a cap in an effort to allow the pulp to heal on its own. Our study intended to compare two of those medicines, calcium hydroxide and mineral trioxide aggregate, both Federal Drug Administration FDA approved products, to determine if one performed better than the other. 