Quick search:
Wet a tea bag and bite on it like he bit on the cotton the dentist gave him. Use regular black tea, not an herbal tea bag. The tea has Tanic Acid in it which helps clot blood. Do not rinse today, or brush the area. Do not do anything that will disturb the forming blood clot, such as: smoking, drinking from a straw, or vigurous rinsing and spitting.