Does a spicy chili affect pH level?

When you eat a spicy chili, the capsaicin in the chili will bind to receptors in your mouth and throat, sending signals to your brain that you are experiencing a burning sensation. In response to this, your body will produce saliva and mucus to try to cool down the burning sensation. This saliva and mucus will have a slightly alkaline pH, which can raise the pH level in your mouth and throat. However, this effect is usually temporary and your pH level will return to normal once the burning sensation has subsided.