Hello, the swollen Gum might be due to injury caused by the food particle, so you can apply chlorhexidine gel in that particular area for 2 to 3 times a day until the swelling reduces.
Next Steps
If the swelling still persists, then visit a dentist.
Health Tips
Along with gel application, you can also do lukewarm salt water gargling for 2 to 3 times a day for relief.