Brought to you by TRESemmé Keratin is one of those much used yet rarely explained beauty buzz words. With that in mind, we've decided to do a little investigation into the ' fibrous structural protein' and how it works to protect your hair. Firstly, it's a protein found in hair, skin and nails. It works as a protective layer but is often damaged as a result of physical, chemical and environmental damage and you know, general wear and tear. So when keratin is lost, you need to replenish it and that's where the TRESemmé Keratin Smooth range comes in. By using these products at home on a daily basis, you're restoring keratin to your locks, allowing for a smoothing effect. Over time, your hair will become stronger and healthier. Rather than a one-off treatment at a salon, which will work for a couple of weeks while costing you a bomb, this is a hair care system designed to be used at home. If your hair is dry, frizzy and damaged, then trying a product line that specifically targets these problems might be the way forward. Blake Lively's hair. THE DREAM (via giphy) The 7 Day Keratin Shampoo and Conditioner (retailing at €9.49) are designed to give you smooth sleek hair for up to seven days and that's the dream for unruly-haired girls everywhere. If the 7 Day option doesn't appeal to you, there's the Smooth Infusing Shampoo and Smooth Restoring Conditioner (€7.49) and as you can tell from the names, they're all about the smooth. There's also a Heat Protection Shine Spray (€7.99) which is like a protective veil for the hair before using any heated appliance, thus lessening the amount of damage to your barnet. If you're having an exceptionally bad hair day, there's a SOS product in the form of the Smooth 60 Second Treatment Shot (€2.10). This bargain buy should be applied for 60 seconds after your regular shampoo and condition regime is finished - a quick fix for frizzy hair. Hair oil has become a cult product in recent years and the range wouldn't be complete without the Smooth Beautifying Oil, (€9.40). Applied damp, it works to tame frizz and it can also be used on dry hair to add shine and smooth any flyaway hairs. For more information on the Keratin Smooth Products, click here