General Soreness and Irritation
When you get your braces on, you may feel a general soreness in your mouth and your teeth may be tender for three to five days. If the tenderness is severe, take aspirin or whatever you normally take for a headache or similar pain. The lips, cheeks and tongue may also become irritated for one to two weeks as they become accustomed to the surface of the braces.
You can put wax on the braces to lessen this.
Sores may appear as your lips, tongue and cheeks toughen as they become accustomed to the braces as well, this can be relieved by rinsing your mouth with a warm saltwater mouthwash. Dissolve one teaspoonful of salt in 8 ounces of warm water, and rinse your mouth vigorously. Sometimes your jaw may be sore as well. A warm wash cloth or heating pad may reduce this.