hey welcome to LHCF
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When she said leave-in she meant a leave in conditioner...One of the ones I use is Neutrogena Tripple Moisture Silk Touch leave-in conditioner...it keeps your hair very moisturized...
And a protien treatment is used when you are experiencing breakage...it stops the breakage...and prevents more....I do it once a month...I use Aphogee protien treatment for damaged hair...what i do is i wash my hair...put on the protien treatment and sit under the dryer for a while...until it gets hard...than i rinse it out and DEEP Condition my hair...
And yes leave ins are the best...lol..I dont know what I would do without my NTM!!!