The Face Shop’s Face It Extreme Dot Pen Eyeliner EX in 01 Black can actually be used for the subtlest, most natural look that’s far from extreme. A felt-tip liquid eyeliner pen, the eyeliner’s main selling point is the three-pronged fork tip designed for tightlining between lashes.
Other companies have come up with this same type of eyeliner (e.g., KATE, Clarins, Too Faced). I’ve tried Too Faced’s 3-Way Lash Lining Tool but it smudged after a few hours, leaving me with panda eyes. Happily, the Face Shop’s version has a better, longer-lasting formula.
The formula dries to a shiny inky black and is supposed to be water-, sweat-, and sebum-proof. I can vouch for its all-day wear in between my lashes and long-but-not-quite-all-day wear on my watery waterlines, which are where I wear this. However, the arm swatches washed off easily with some water and rubbing, so I’d be careful about using this in rigorous conditions (swimming, under a shower).

Although the eyeliner is supposed to work as a regular eyeliner as well, it’s hard to use that way because you must constantly be aware of the angle at which you’re holding the tip; turn it slightly the wrong way and suddenly the line is a lot thicker than you intended. Also, the tip–even turned on its side–is not precise enough to do a cat flick and the formula tends to bleed ever so slightly. That said, if you just want to slap on a ton of eyeliner in a quick pass, the prong tip can cover a lot of area at once. Maybe that’s why it’s called “extreme”!
To tightline, I like to gently hold up my eyelid with my left ring finger (I’m right-handed) and dot this from underneath the lashes along the lashline and waterline. I use a wedge-and-wiggle motion to work this in between the lashes. It takes 2 to 3 passes to get the line as dark and solid as I prefer. (On skin that’s not as wet as the waterline, 1 pass will be enough.) See also here and here if you’re unfamiliar with tightlining.
For an extremely natural look, I use just this and no other eyeliner. Other times, when I’ve applied eyeliner to my upper lashline, I use this to fill in the waterline and any unfilled gaps along the lashline. Totally optional, but it helps give an ultra-finished look to eye makeup.
Pros: Extremely natural looking. Lasts all day in between the lashes. Lasts a long time along the waterline; when it does fade away it doesn’t cause panda eyes.
Cons: Hard to use as a regular eyeliner. Sometimes smudges on the very corner of the eye.