All you need is a comb with a tapered point on the end.
- comb hair staight back along the part.
- Take the pointed end of the comb and with a little pressure draw in a z zig zag motion along the part line towards the back of the head.
- separate the hair, and your left with a zig zag part
- then with your fingers fluff hair near the roots buy pushing in towards the part
Your left with the roots in your part being less noticeable. This works best for hair with roots that are less than an inch.