The hand over mouth exercise.
Barton
D H
DH
D001521:Behavior Therapy / Q000379:methods; D002648:Child; D002675:Child, Preschool; D003625:Data Collection / Q000379:methods; D016854:Dental Anxiety / Q000209:etiology; D019140:Dental Care for Children / Q000379:methods* / Q000523:psychology; D006801:Humans; D012149:Restraint, Physical / Q000009:adverse effects*