It formaldehide free?

no it is not formaldehide free.

What is the difference between the clarifying and smoothing shampoo? Which one comes before applying the keratin treatment?

The clarifying shampoo is to remove all toxins from the hair before you treat the hair with the keratin treatment. Difference between clarifying and smoothing is: Clarifying is ONLY used before applying the keratin treatment. The smoothing shampoo is what you can use following treatment to maintain your treated hair......You could use any shampoo for maintenance/daily shampooing as long as it is sulfate free.

ASIN	B01N9WY89H
Best Sellers Rank	#139,529 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #3,233 in Hair Shampoo
Is Discontinued By Manufacturer	No
Item model number	B01N9WY89H
Manufacturer	Chemco Corp
Product Dimensions	1.5 x 1.5 x 4.2 inches; 2 ounces
UPC	755439921104

KERAGEN Clarifying Shampoo, Professional Hair Treatment Primer & Restorative Deep Cleanser – Deep Cleanse. Fortify. Don't Compromise. For Flawless Treatment & Visibly Clean, Vibrant Hair – 2 Oz

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