Common causes of toothache / pain in jaw -
1. Dental Caries with infection spread to the pulp
2. Cysts in the bone
3. Grossly decayed tooth from where infection has spread to the underlying bone
Since we don't have pics, it's hard to say what's the exact cause.
Calcium deficiency is not the cause here for sure.
Next Steps
Visit a nearby dentist
Health Tips
Take a pain killer in case of too much pain, but it's always better to consult a professional dental surgeon first!