In my opinion you could have decay in your molar teeth which may not be visible in the mirror. It is highly unlikely that the Wisdom teeth that were removed could be causing the pain as it is 4 months since the surgery.
Next Steps
You should visit your dentist and get an xray done for that region. An OPG would be even more benificial.
Health Tips
Take tab ketorol dt 10mg and visit your dentist at the earliest.