 Fear of injections is one of the main reasons people avoid the dentist. And patients will judge your skills as a dentist by how well you deliver dental anesthesia. Of all the injections, the inferior alveolar nerve block is the most common. This injection has a surprisingly high failure rate, up to 25%. That means that in the average dental office, we perform 10 inferior alveolar nerve blocks each day. And on average, for two patients, this injection fails. But why is that?