Self injury most likely caused after extraction in children is
Inadvertent lip biting after anesthesia
Chemical burn
Permanent palsy
Trismus
Inadvertent lip biting after inferior alveolar nerve block is most commonly seen in children after extraction.
This self-injury mostly occurs due to dentist fail to mention/provide important instructions to child/ their parents that he/she should not eat anything till effect of anesthesia completely wears off as it leads to unknowing/ Inadvertent lip biting during eating.
Sometimes this also happens if child/parents fail to follow the instructions mentioned by dentist.