Preparations for Permanent Waving or Straightening Hair

FDA has issued warnings about hair smoothing and straightening products that release formaldehyde during use, citing health risks to consumers and salon workers. Importers of such products should ensure formulations comply with FDA's current guidance, that labeling accurately discloses ingredients, and that formaldehyde or methylene glycol content is within acceptable limits. Products found to be adulterated or misbranded may be refused entry. Consulting a licensed customs broker or regulatory counsel is advisable.

The distinguishing factor is chemical function: permanent waving and straightening preparations are specifically formulated to chemically restructure the hair fiber, typically through reduction-oxidation chemistry. Conditioning treatments, masks, or leave-in products that do not alter hair structure are classified under heading 330590 as other hair preparations. The product's formulation, intended use, and labeling are the key classification determinants.