I came across this article in the Vanguard, on handling dental emergencies, it seems very helpfull...

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By Sola Ogundipe

INJURIES  to the teeth or gums can be potentially serious and should not be ignored. Ignoring a dental problem can increase the risk of permanent damage as well as the need for more extensive and expensive treatment down the road.

Here's a quick summary of what to do for some common dental problems.
Toothaches -First, thoroughly rinse your mouth with warm water. Use dental floss to remove any lodged food. If your mouth is swollen, apply a cold compress to the outside of your mouth or cheek. Never put aspirin or any other painkiller against the gums near the aching tooth because it may burn the gum tissue. Cracked or broken teeth. Save any pieces. Rinse the mouth using warm water; rinse any broken pieces. If there's bleeding, apply a piece of gauze to the area for about 10 minutes or until the bleeding stops. Apply a cold compress to the outside of the mouth, cheek, or lip near the broken/chipped tooth to keep any swelling down and relieve pain. See your dentist as soon as possible.

Knocked-out tooth - Retrieve the tooth, hold it by the crown (the part that is usually exposed in the mouth), and rinse off the tooth root with water if it's dirty. Do not scrub it or remove any attached tissue fragments. If possible, try to put the tooth back in place. Make sure it's facing the right way. Never force it into the socket. If it's not possible to reinsert the tooth in the socket, put the tooth in a small container of milk (or cup of water that contains a pinch of table salt, if milk is not available) or a product containing cell growth medium.

Full Article and other dental emergencies