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Canker sores on the gums are small, painful ulcers that can make eating, drinking, and brushing uncomfortable. Common triggers include stress, minor mouth injuries, acidic foods, vitamin deficiencies, and irritation from certain toothpastes. While most sores heal on their own within 1–2 weeks, recurring or severe sores may need professional attention. Maintaining good oral hygiene, avoiding trigger foods, and reducing stress can help prevent future outbreaks and keep your gums healthy.