Peripheral neuropathy. Would be helpful.

My friend, went to a dentist to get her wisdom tooth removed. After getting it removed immediately next day her lips and right cheek got swollen. We could see some burnt marks too in the inside of cheek. She couldn't eat for few days or talk properly. Later when we asked doctor he told it might be bitten mark or accepted some hot motor has touched her inside cheek while removing wisdom tooth. She has little sensation on her right cheek and feeling pain in her tooth since then even though she says she is recovering minimally everyday from numbness but she has some strange feeling on her teeth, just like some pressure applied. Doctor telling tranisent peripheral neuropathy and its common , but its nearly 4 weeks she hasn't recovered fully . she is on neruobion tablet. Any suggestions as to how many days it takes to get cured. Any other medication or therapy required, would be helpful.