I have had this Mascara for quite some time. It is one of my staple make-up bag items which I use every time I am going on a night out or want that added lash effect.
I have very unruly eyelashes on one side they curl just right but on the other they point straight out, most mascara's have problems curling the straight side but this is a genius!
What Smashbox say about the product:  
Long  lashes not in your genes? Our revolutionary new  scientifically-engineered mascara is packed with proteins and amino  acids that bind to lashes for genetic defying length and strength. The  unique double helix brush grabs each lash, no matter how small, for the  ultimate fanned out effect. Dramatic jet black shade intensifies and  defines. Defy genetics with Lash DNA Mascara. Revolutionary Double Helix  Brush- Specially-engineered design lengthens,  separates & defines  each lash- Delivers intense, jet black lashes- Lashes instantly look  bigger, bolder, longer  &;more defined- Sweeps lashes up & out  for a gorgeous, doe-eyed effect.
The pictures below really don't do this product justice
I love the unique brush because it does a great job of placing product at the roots to give the illusion of fullness and then creates that beautiful doe eyed look when you turn the brush vertically and fan the lashes out.
This is my number one mascara at the moment for dramatic no need for false lashes effect.
You can purchase Lash DNA for £18.00 from  
Debenhams website and selected Debenhams stores Nationwide.
*PR sample all views are my ownLabels: Lash DNA, mascara, review, Smashbox, Smashbox Lash DNA