Question:
Can I twist my hair (two strands) overnight to create, maintain, or enhance existing waves/texture?
Answer:
Twisting hair in order to make waves should not be done on Shabbos or Yom Tov, however if you already have the curles, and you want to maintain them or even enhance them slightly, that would be permitted.
Best wishes
Sources:
שש”כ י”ד-נ”ט, פוסקים
