During the root canal procedure, your dentist will apply a local anesthetic to reduce your discomfort. As it wears off, the pain and sensitivity will kick in. Because your mouth will feel swollen, do everything to help it cope with what it has just gone through.
Pay close attention to how you use your mouth. Wait for a few hours before you eat anything. When you do, avoid biting your tongue or grinding your teeth. If the swelling persists, you can use an ice pack to numb the discomfort. When you sleep, prop your head up with pillows for better blood circulation.
You might want to plan your meals for the first few days. The key is how to get proper nutrition while exerting the least effort from your mouth. Try a soft diet of soup, pureed foods, and smoothies.
If you’re a smoker, minimize your smoking or try to avoid it altogether over the next few days. Remember that the fewer chemicals that go into your mouth, the faster it will heal.