I am responding to a LADL member who needed help with Caroline curls. I find it easy to smooth out curls with an unused, clean toothbrush.
This toothbrush should only be used for brushing the doll's hair. I start by brushing a section of Caroline hair one section at a time. Once each section is brushed out, take the ends of the hair in that section starting at the bottom and twist the hair while attached to the bristles of the wire brush counter clockwise until a curl ringlet forms.
Gently release brush using your fingers and repeat for each section. Use the toothbrush to brush tiny flyaway hair, or use it to smooth hair for up dos.
Hope this helps. I did this without water detailing at the bottom and working my way up each section. Spray a little water on hair if too dry or frizzy and begin.