Cannot rule out any cavity through this OPG but impacted wisdom tooth is there which needs to be extracted to save damage to its adjacent tooth.
You can get a dental checkup done to check for those black spots and figure out whether they are superficial cavity or stains.
Next Steps
If superficial cavity is there filling needs to be done otherwise for black stains removal teeth cleaning is advised.
Health Tips
Get lower right wisdom tooth extracted done as soon as possible.