Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Why i picked these items:
Malady: For the attack speed and lifesteal. the lifesteal will come in handy late in the game.
Bersrker Greaves: for more attack speed and movent.
Madreds bloodravor: for the damage and attack speed.
Exinity Edge: for the damage.
Frozen mallet: for the health an slowing ability.
Phantom dancer: for even more attack speed.
Teemo is all about attack speed thats why almost all items are about attack speed.
What I found out about teemo is that his pioson does all the work. Lower the health of an enemy then shoot the enenmy with your dart so it looks like he has no health left and you dont have a worry about him anymore. Also, teemo is a gank setter so talk to team mates and set ganks with him.
If fighting a enemy with higher health than you always use blinding dart when the enemy champ is making his first move not your first move.
be aware of champs that have farther range attacks than you teemo doesnt have a far range attack so they can be deadly.
Teemo can take enemys 1v2 by always blinding one and attcking the other and they will die.
When you have move Quick is fully upgraded. Use teemo as a hit and run player and do a lot of jungling.
Finally always harass players.
Thanks for looking at my build will add more later.