Can I use this with extensions?

Yes just on your lengths. Avoid the tips if you have k-tips. You can also use the Gloss Absolu hair oil - a little goes a long way and it's super light. They both smell amazing.

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Kérastase
Genesis Strengthening Hair Mask

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Size: 200 mL/ 6.8 oz

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Kérastase
Genesis Strengthening Hair Mask