We can't give proper suggestion untill we get proper full information.
This may be due to Sudden cold , any injury , exhaustion , gum or mouth infection , wisdom teeth etc.
For proper treatment Consult Doctor or Me online or offline and take help.
Next Steps
1.Gurgling with luke warm water.
2.If external cheek is very painful then alternater apply of hot and ice.
3.Rest your mouth.
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