If you have a broken tooth, you'll want to see a dentist right away to increase your chance of saving the tooth and minimizing any permanent damage to your teeth. In the meantime here are some steps to take to treat your tooth injury.
If the tooth has been knocked out completely, find and pick it up by the non-root end and rinse with room temperature water. It's important to keep the roots wet and prevent further injury from happening. You can keep the tooth in a glass of salt water, milk or in a real pinch your mouth, but do not attempt to place it back in the socket. There is a 50% chance that your dentist will be able to save the tooth if you seek treatment in time.
If a piece of your tooth has broken off, try to save the broken off pieces. Using warm water, gargle and rinse your mouth well, as well as any pieces you were able to save. Treat any bleeding by firmly applying pressure with a piece of gauze. To help prevent swelling, you can hold a cold compress over the injured area and take acetaminophen, ibuprofen or other over the counter pain reliever. If it will be a while before you can see a dentist, you can temporarily repair the break with dental cement, which you can buy at a pharmacy.
It is very important to seek prompt dental care for broken teeth to prevent decay and infection. Nerve damage is a real possibility when a tooth breaks and can be painful. Infections can spread to the gums and can become serious enough to affect your total health.
Your dentist will treat a broken tooth in a variety of ways depending on the extent of your injury. Minor chips might not require any repair at all, although you might opt to have it done for cosmetic reasons or to prevent further damage. Sometimes small breaks can be treated by filing and polishing the tooth. A larger break or crack in your tooth might require a filling or even a root canal and crowns, or in extreme cases an extraction.