Another thing to take note of is how often you wash your hair. The thing is, bangs get greasy faster than the rest of your hair. If you don't wash them every day, there's a tendency that they will clump, separate, and lay flat. You may opt to wash your bangs daily or use dry shampoo to keep them looking fresh.
Try: Suave Essentials Daily Clarifying Shampoo, $10.06
One of the reasons why your bangs are acting up could be that you need a trim. Either give your hairstylist a call, or consult with them on how you can do this at home.
Try: Elfina Hair Cutting Shears/Scissors and Professional Barber Thinning/Texturizing Set, $14.99
Your forehead may also be the culprit why your bangs are getting funky — you see, an oily forehead may cause your bangs to separate and lay flat. Make sure to keep your forehead (and by extension, your bangs) oil-free by using blotting paper during the day.
Try: Tatcha Original Aburatorigami Japanese Blotting Papers, $12