The House-Brackmann grading system is used to grade facial nerve paralysis as follows:

• Grade I – Normal
• Grade II – Mild dysfunction, slight weakness on close inspection, normal symmetry at rest
• Grade III – Moderate dysfunction, obvious but not disfiguring difference between sides, eye can be completely closed with effort
• Grade IV – Moderately severe, normal tone at rest, obvious weakness or asymmetry with movement, incomplete closure of eye
• Grade V – Severe dysfunction, only barely perceptible motion, asymmetry at rest
• Grade VI – No movement