Pulpitis does not necessarily cause pain when the tooth is tapped. When we talk about pain from tapping a tooth, it mainly refers to examining pain in the apical area. If tapping the tooth causes pain, it indicates that the inflammation has gathered at the root tip, manifesting as what is clinically described as tenderness upon percussion. Pulpitis may simply be a bacterial infection of the dental nerve, localized around the nerve or confined within the roots, where the nerve is infected but the apical nerve remains intact. In such cases, tapping the tooth would not cause pain. This means that in the early stages of pulpitis, there might not be tenderness upon percussion, but spontaneous pain from the dental nerve or pain triggered by temperature changes might still occur.