Certain acidic foods and new oral appliances can leave your gums feeling sensitive and sore, respectively. Acidic foods can cause irritation and even visible sores on the tender tissue of the gum line. Canker sores and even gums that are recessed can be an unfortunate side-effect to consuming things like citrus fruit, soft drink and sugary brands of yogurt in excess. Therefore, try eliminating acidic foods from your diet, and see if your sensitivity goes away over the next few days. The same goes for oral appliances: Braces, retainers, dentures and mouthguards can all tug at your gum line, leaving it extra tender if they've temporarily exposed more sensitive underlying tissue. In some cases, this sensitivity will go away as your mouth adapts to the appliance. If your gums continue to hurt, however, see your dentist or orthodontist to ensure the right fit with less sensitivity.
Gum disease is often the reason for periodontal soreness, but it's not always the reason for your sensitivity. Gums that are sensitive without bleeding might be trying to tell you a different story. Before attributing the pain to gingivitis, consider some of the other causes – you might be surprised at which of your habits could be causing sore gums.