Hi.. if the wound is on cheek and if it was caused by accidental cheek bite then usually it will heal but in your case it is paining and that too you are experiencing radiating pain which indicates infection. So try not to chew from that side, apply topical antibiotic gel on the wound area, check for any sharp tooth adjacent to the wound area.
Next Steps
Maintain oral hygiene, rinse after every meal, use mouthwash for 1 week atleast.
Health Tips
If the pain is not getting reduced then best to visit a dentist. If there is any sharp tooth associated with the wound area the dentist will smoothen it off