The three side bonds that give hair its shape are hydrogen, salt, and disulfide bonds. Which list correctly orders them from WEAKEST to STRONGEST?
Explanation
Hydrogen bonds are the weakest of the three; they break with water and reform when the hair dries, which is why wet-set styling holds until it gets damp again. Salt bonds are intermediate; they break with strong acids or alkalis. Disulfide bonds are by far the strongest; they require a chemical reducing agent in a permanent wave or relaxer to break. California licensees rely on this hierarchy when performing thermal styling versus chemical services under CCR Title 16 §979.4. Option D reverses the order. Option C swaps salt and hydrogen. Option B ignores the published bond energies that any chemistry textbook for cosmetology lists.
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