The goal of this clinical study is to find out whether different electronic acupuncture wave forms can effectively treat recovery-stage Bell's palsy in adults and evaluate their safety.

The main questions it aims to answer are:

• Can targeted electronic acupuncture wave forms improve facial nerve function in patients with Bell's palsy?
• What is the optimal electronic acupuncture waveform for different degrees of facial nerve injury?
• What adverse events may occur during electronic acupuncture treatment? Researchers will compare low-frequency continuous wave electronic acupuncture and intermittent wave electronic acupuncture to determine which waveform works better for recovery-stage Bell's palsy.

Participants will:

• Receive either low-frequency continuous wave electronic acupuncture or intermittent wave electronic acupuncture every other day for 4 weeks
• Undergo surface sEMG and ENoG examinations at baseline, Week 2, and Week 4
• Complete facial function assessments and safety evaluations at each clinic visit

Inclusion Criteria for Bell's Palsy Subjects：

• Meet the above Bell's palsy diagnostic criteria;
• Age 18-65 years, either gender;
• Disease course in recovery phase (21 days ≤ course ≤ 6 months) and not recovered (FNGS 2.0 score >4);
• Voluntarily participate in this study and sign informed consent.

Inclusion Criteria for Healthy Subjects：

• Do not meet the above Bell's palsy diagnostic criteria;
• Age 18-65 years, either gender, matched to Bell's palsy subjects within 5 years for age and gender;
• Normal facial nerve function, FNGS 2.0 score = 4;
• Voluntarily participate in this study and sign informed consent.

Exclusion Criteria for Bell's Palsy Subjects：

• Facial trauma, skin lesions, or other diseases that may cause facial paralysis symptoms;
• Diagnosed with Ramsay Hunt syndrome (herpes zoster oticus);
• Bilateral facial paralysis;
• Previous history of facial paralysis;
• Facial synkinesis, contracture, or spasm already present;
• History of facial surgery;
• Uncontrolled diabetes, hypertension, severe cardiac, hepatic, or renal disease, cognitive impairment, aphasia, or mental disorders;
• Pacemaker use;
• Pregnant or lactating patients.

Exclusion Criteria for Healthy Subjects：

• Facial trauma, skin lesions, or other diseases that may affect facial muscle activity;
• Previous history of facial paralysis;
• History of facial surgery;
• Uncontrolled diabetes, hypertension, severe cardiac, hepatic, or renal disease, cognitive impairment, aphasia, or mental disorders;
• Pacemaker use;
• Pregnant or lactating patients.