The goal of this clinical study is to compare patients' self-reported pain and mental stress during infiltration anesthesia between conventional syringe and Dentapen. Outcome 1: VAS score of self-reported pain during dental anesthesia Outcome 2: Heart rate variability during dental anesthesia
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Heart rate variability
Timeframe: From enrollment to the end of tooth extraction treatment at 4 weeks. Each patient experienced two extraction treatments with 4-week interval.
Self-reported pain
Timeframe: Patients reported right after dental anesthesia delivery.