Teemo is a small furball of doom that has the power to wreck any team before him given the right items, positioning, and tactics. He can flatten any ADC in his path because of his blind and his auto-attacks. Teemo is an all around great champion except that sometimes he is easily picked off because of heavy CC. Overall, I made this guide to wean people from building - ugh - Nashor's Tooth on Teemo because I see it as uneffective.

As Teemo, shrooming can be the difference between living and dying from a gank. When you play as teemo you should shroom in high traffic areas. You should also shroom in brushes so you can save money by not having to buy as many wards.

As Teemo you might do a lot of damage BUTyou are not invincible. Sometimes things go wrong in the laning phase and all you can do is wait it out and rush a rabadon's deathcap so you can start being a viable APC.

Teemo is a good champion and I personally think that if you haven't at least tried Teemo then you are missing out on a great experience. Teemo is a hard counter to a lot of champions and will normally win games for you because of his sheer damage.

[P.S. - You only really have to worry about fellow Teemos or any tanky champs with an execute (i.e. Darius & Garen)]