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Extreme Deep Fuel durable strengthening treatment helps restore your very distressed hair back to its natural, healthy state. A durable conditioning agent provides long-term conditioning and repair that lasts up to eight shampoos.  For hair that is up to 4 times stronger. Extreme strengthens and resurfaces chemically and mechanically distressed hair. Redken's exclusive Interbond Conditioning System delivers a unique 3D Repair Complex to fortify hair so it looks and feels healthier with increased manageability and shine.