A: Do NOT handle the roots of the tooth. Handle only the chewing edge -- the crown portion of the tooth.
Do NOT scrape the root of the tooth to remove dirt.
Do NOT brush or clean the tooth with alcohol or peroxide.
Do NOT place tooth in water
If the tooth is dirty, do NOT clean it. This could damage the tooth. Place the tooth back into its socket. The tooth has a better chance of surviving if it's kept in its natural environment. If you cannot get the tooth back in its socket, tuck it between your cheek and gum. Another option is to put the tooth in a container of milk. You can also buy a kit at some pharmacies. It contains a solution similar to natural saliva. The most important thing is to keep the tooth moist.
Remember, if you act quickly and get to your dentist as soon as possible, there's a good chance the tooth can be saved.