Your soft tissues are supplied by a large number of blood vessels, for this reason, injuries to your lips, cheeks, or gums can cause a lot of bleeding.
You can try to minimise the bleeding by first rinsing your mouth with a salt-water solution to disinfect the area. Make sure the water is not too warm, as heat can increase bleeding.
Next, apply pressure to the area with a clean piece of gauze for 20 minutes, using your fingers. Be sure to sit still and in an upright position, this will help to reduce the bleeding.
If the bleeding fails to stop, then you should contact us immediately for telephone advice. If it is outside normal trading hours, then you should visit an after-hours dentist or doctor as soon as possible.