I tested this for a survey site a while ago. I've no idea how well it works on curly hair but I'd really avoid it if you've already got pretty straight hair as it made very little difference to my hair.

Basically it's like a hair dye and shampoo/conditioner but you've to keep your hair smoothed down while applying it then when blow drying your hair you've also to keep it as straight as possible (which would straighten my hair anyway without the treatment) then you can straighten hair with straigheners and hair should stay straight for up to 40 days.

You just need to remember to keep blow drying it without moving your hair around too much to keep it straight.

Charles Worthington Salon at Home Straight and Smooth hair straightening kit - Boots

I wouldn't have been happy if I'd paid £19.99 for it as it just wasn't noticeable on my hair but as I said, my hair is quite straight as it is so i'm not sure how well it would work on those with curly/wavy hair.

If anyone with curly hair does try it, please reply and let us know how it worked for you.

D