Inclusion Criteria:  healthy children need a simple treatment for temporary teeth in the mandibular jaw children with positive and definitely positive behavior according to frankl behavior classification children with no known allergy to local anesthesia children with no previous treatment from the same researcher children with no previous experience in using the VR device  Exclusion Criteria:  children with negative and definitely negative behavior according to frankl behavior classification children with known allergy to local anesthesia children with emergency dental treatment in the mandibular jaw children with previous treatment from the same researcher