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Biting the tongue accidentally is very common. Fortunately the tongue heals itself quite quickly. But rinsing with a cup of warm water and a teaspoon of salt can, indeed, be soothing and the salinity also promotes healing of the wound. Using an aloe vera gel can also help speed the healing process. Some people find that applying just a bit ofmint flavored toothpaste to the affected area can sooth the stinging, if only temporarily.
As long as the wound isn't deep, it should heal itself within two or three days.
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You mentioned that the cuts aren't too deep but have been there for several days. If it has been that long you may have re-injured the area. This is common. If the injured area of the tongue swells a bit, it is more likely to be bitten again. But if you feel there is no new bite, the healing process should be noticeable - less soreness, etc. If after ten days to two weeks the area does not seem to be healing it might be wise to have your dentist examine the area.
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