Braces could be one of the reasons for mouth sores. It’s not just your teeth that need to adjust to dental braces. If you’ve recently had braces installed or adjusted, mouth sores can become an all-too-real annoyance. Normal, daily activities can become very painful. One essential for treating mouth sores from braces: orthodontist wax. Applying this wax (usually given to you by your orthodontist, but also available at pharmacies) to your braces can help prevent mouth ulcers from getting worse, though it is not designed to relieve pain or quicken the healing process.