Can Fine Hair Be Permed? Volume, Curl, and Flat-Root Considerations
Want volume from a perm but worried about damage? What hair density, root support, colour and perm history, curl size and home styling tell us.
We can discuss perms for thin and soft hair, but "thin hair" and "less hair volume" are not the same thing. Before designing, you need to observe the root support, overall density, length, weight and past dyeing and perming to determine the appropriate curl and range.

Why does thin hair tend to flatten easily?
The hair itself has low support, coupled with oiliness, length and weight, or excessive hair care products, it is possible that the hair roots are close to the scalp. A perm can adjust some lines, but it won't change the actual hair volume.
The smaller the roll, the more fluffy it will be?
Small curls may increase visual bulk and also bring about more obvious curls and retraction. If you are looking forward to a natural curvature, you should also discuss the cutting, root direction and daily blow-drying methods, rather than just pursuing the curlier the better.
Thin and soft hair after dyeing needs more evaluation
Bleaching, dyeing, repeated color touch-ups, and past perms may reduce your hair's tolerance. If your wet hair has abnormal elasticity, ends are broken, or is very dry, you may need to trim and take care of your hair first.
Don’t overdose on household products
If heavy hair masks and oils are applied close to the hair roots, they may cause the lines to flatten faster after perming. Place the product in the required area according to the designer's recommendations and learn the appropriate blowing gestures.
You can read How to choose perm types first, and then send photos of the situation to Faye Designer LINE.
Actual volume will vary depending on hair volume, hair texture, cut and style.