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Barrow Neurological Institute pain intensity scale [26].
| BNI Class I |
| No trigeminal pain; no medication |
| BNI Class II |
| Some trigeminal pain; no medication |
| BNI Class IIIa |
| No trigeminal pain; managed with medication |
| BNI Class IIIb |
| Persistent trigeminal pain; managed with medication |
| BNI Class IV |
| Some trigeminal pain; not adequately managed with medication |
| BNI Class V |
| Severe pain or treatment failure |
