PSA: If One Or More Of Your Laners Are Constantly Being Dove Under Tower And Dying....
...GO HELP THEM!
Stop worrying about what you're currently doing (unless it's a free drake, Rift Herald or tower) and go help your teammate!
I just got out of a game where our Top Lane Teemo was going against a Riven. When laning phase first started, laning phase was going great for Teemo. At least until the enemy Lee Sin jungler ganked and killed him. No big, right? Well, it wouldn't be had the Lee Sin not come BACK up to top lane to dive our Teemo under tower (with Riven) and kill him the moment he teleported to lane. At this point, Teemo considered himself camped and began to stay under tower, letting the wave eventually push to him. Didn't help because Lee came up there again.
At this point, Riven was now basically taking a free tower. But, instead of defending the tower, our Jungler decided instead to get the Krugs. The Krugs. The ones no more than two feet from the damn tower. When confronted about his lack of assistance, by Teemo and myself, Zac went on to tell Teemo that he needed to ward to keep from dying.
Which brings me to the next point of the PSA: Wards DO NOT...I repeat...DO NOT protect you from being dove under your tower. Stop using this as a cop out for your own refusal to assist your teammate! Wards don't do anything but give you vision. Yes, vision deters ganks. More vision, less gankability [it's a word, I swear]. However, wards do not save you from tower dives. Especially if you are Teemo being dove by a Lee Sin and Riven.
The Zac then went on to tell Teemo that he should have simply gave up the 'Full HP" tower (it was still full hp after the 2nd gank, and before the 3rd gank/dive) to Riven for free. He decided that giving the enemy team a free first blood tower was a BETTER OPTION than HELPING HIS TEAMMATE NOT FEED.
Once Teemo and I had basically proven that Zac was wrong in this scenario, and he finally accepted that he was, Zac decided to change his argument to "well, you should have played Poppy instead".
Like, what? The player chose Teemo. They clearly did NOT pick Poppy, so how does bringing her up mean anything for this situation? Again, another cop out.
TL;DR: Wards deter ganks. They do NOT defend against constant tower dives. Choosing NOT to assist your 'currently feeding' teammate makes YOU a part of the problem. (Especially when they are the only one who needs assistance, at the time.)
[Extra Note: The Zac player was doing nothing but farming all game and didn't gank, at all, until AFTER Lee and Riven were fed.]
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Its a very efficient item on anyone who is behind; kinda like a crutch to lean on.
It will automatically keep the minions from reaching his turret, get most of the cs,
and they physically can't dive him as long as it's under his turret if they don't have
a huge wave (placed slightly behind but right under tower).
also gives armor and regen, along with ms to get back to lane faster if he needs to recall. Most people won't admit defeat and buy it though; they think it's silly, so there's that.