24 hours: Tongue irritation from baking soda/peroxide toothpaste can last up to about 24 hours. Try sticking to bland, soft foods for that period, including cold foods to soothe the irritation. Drink lots of water or electrolyte solutions to help wash away bacteria and other irritants. Avoid spicy/acidic foods that may cause extended irritation and sharp foods that may damage irritated mucosa.
Answered 7/29/2020
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