Frequently Asked Questions Hair Extensions FAQ Will great lengths ruin my hair? Great Lengths specially formulated bonds have been scientifically proven not to cause damage to hair How long do great lengths hair extensions last? Up to 5 months Are great lengths 100% human hair? Yes. finest quality hair is used to ensure easy maintenance Why great lengths? They are the international leading hair extension system favoured by many celebrities How long do Russian extensions hair last? 3-4 months if cared for as advised at consultation Can I colour my extensions? Colouring is not recommended. Colour can damage both hair and bonds. Once hair has been coloured it will disqualify any guarantee with the hair. Can I tie my hair back when wearing hair extensions? Yes, hair extensions should be tied back loosely making sure not too much pressure is on the scalp. You can create soft glamorous up dos with extensions. Yuko FAQ How long does YUKO process take? 3-4 hrs depending on hair type How soon can i wash my hair? 48 hours after treatment. How does YUKO work? The solutions work by physically changing the internal structure of the hair permanently. Is YUKO safe? Yes. YUKO solutions do not contain any chemicals that produce formaldehyde or any other cancer causing substance. Will YUKO ruin my hair? YUKO is not just about straightening the hair, it also re-texturises your hair to a healthy shine.