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What is Name the technique which usually involves teaching the patient how to induce a state of deep muscle relaxation and describing imaginary scenes relevant to his fear: and explain in detail?
Desensitization: The technique usually involves teaching the patient how to induce a state of deep muscle relaxation and describing imaginary scenes relevant to his fear.
Indications of desensitization are:

Child's initial visit.
At subsequent appointments when introducing dental procedures which are new to the patient.
When treating referral patients.