This clinical trial is an extended clinical trial for test subjects who participated in the phase 3 clinical trial of PT\_BTA\_P3\_21 (clinical trial plan number) and completed follow-up observation up to 16 weeks after administration of clinical trial drugs, and evaluates the effectiveness and safety of repeated administration of protoxin in those with moderate or severe brow wrinkles.
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Primary Outcome Measure : We will use FWS(Facial wrinkle scale)
Timeframe: 4 weeks post injection compared to baseline