If I put Latisse on my forehead around my hair line, will it make enough smaller hair grow that my hairline could be lower ?

Hello! Latisse is not FDA-approved for anywhere but the upper eyelashes. Theoretically, it would work to grow hairs on your forehead and darken the skin where you apply it. You can apply it nightly for a 16-week course and then a maintenance dosing of 3-4 times a week to maintain your look. Be careful to only apply it to the areas where you would like to grow more hair. 

Latisse only works while you use it, although after 2-3 months, you can use it in a maintenance dose of 2-3 times per week. Latisse is approved for eyelash growth, and also causes thickening and darkening of the lashes. Incidentally it works on the eyebrows and we believe it to work on all other hair bearing areas, although the studies on this are pending. You certainly could try it off-label, and I suspect it would help.

Using Latisse in this area would be quite costly, but yes, it will work. It will only work while you use it though so it will require you to repurchase it and maintain use of it. Areas like this are currently being studied by Allergan for efficacy and formulations.