One of the principal causes of frustration in the general dentistry its the failure in the blockage of the nerve supply even when we use different kind o anesthetics solution and this can lead to fail in the quality of the treatments especially in the mandibular block where we already know there is a challenge because of the anomalies in the nerve supply of the field, so when we fail the blockage can lead to problems with the behavior specially in the pediatrics, its the aim of this conference to learn how to decrease the failure factors and aim to achieve the nerve blockage.