Inclusion Criteria:  Absolute positive or positive behavior according to the Frankel Scale. Healthy, both physically and mentally. Do not take medications that interfere with the assessment of pain within 24 hours prior to treatment. A child with a MIH-affected mandibular permanent first molar on the right and left sides .  Exclusion Criteria:  Teeth with non-response pulpitis Inflammation at the injection site. Allergy to the substances used in anesthesia. Presence of general or developmental medical conditions.