What Are the Symptoms of Canker Sores?
• Tingling or burning in the mouth; this sensation often occurs six to 24 hours before a canker sore appears. • Small, painful, crater-like ulcers. • Sores appear singly or in clusters on the inside of the mouth, including the inside of the cheeks and lips, on the tongue, at the base of the gums, or on the soft palate. • Usually last five to 10 days. • Sores are grayish white or pale yellow with red borders.