Although there is little evidence for this, you'll find that healing bruises is on most lists of random uses for toothpaste. It is believed that toothpaste helps break up the clot and increase blood flow.
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The time to return to activity and sports depends on the grade/severity of the injury and one's progress with stretching and strengthening exercises. Moderate-to-severe contusions take an average of 4-6 weeks to heal. Minor contusions take considerably less time.