8. Canker Sores
Canker sores are oval, shallow sores that develop on the tongue, gums, or insides of the cheeks, and can be the source of a tingling tongue. The root cause of these sores is unknown. Minor injuries, hormonal changes, bad nutrition, allergies, and other factors impact the likelihood of developing canker sores. However, they should clear up within a week in most cases. It's a good idea to avoid irritants like spicy or crunchy food until they go away.
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