It's definitely possible ... it could turn curly too. Mine was straight until I was 13!
Hair Type: Combo of 2A, 2B and 2C ... with a weird straight underlayer
Fine, normal porosity, normal elasticity.
Low Poo: Yes To Cucumbers Color Protection Shampoo
Cowash: VO5 Moisture Milks
Gel: Herbal Essences Totally Twisted Gel, Tigi Bed Head Creative Genius gel
Started CG 9/10/13