The alcohol in mouthwash can cause a burning sensation if the concentration is high enough. Also many mouthwashes contain menthol which can also cause a burning. It has a minty taste.
If you are experiencing a lot of burning your mouthwash may have a high concentration of one of those two ingredients. Otherwise it’s possible your gum health isn’t great. Mouth ulcers and gingivitis will greatly increase your sensitivity to burning since you open soars that aren’t protected thoroughly.
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