Final answer:
Double strand twist styles are known as two-strand twists and can be performed on wet, dry, or gel-applied hair. They utilize the hair's ability to form new shapes temporarily due to changes in hydrogen bonds when wet.
Step-by-step explanation:
Double strand twist styles, also known as two-strand twists, can be started with wet, gel-applied, or dry hair. Temporary wave techniques rely on the ability of water molecules to intrude into the keratin strands of the hair.
When hair gets wet, these water molecules disrupt some of the hydrogen bonds that help maintain the protein structures. As the hair dries and new hydrogen bonds form, the hair is able to retain a new shape temporarily.
In the case of two-strand twists, the hair will maintain the twist pattern until it becomes wet again or is otherwise disturbed.