Dry hair?!?!?!?

the past few days, ive tried to figure out what has been causing my hair to be so dry...but its getting worse...does anyone know somethin that can make hair dry???or a solution to it???thanks...
Update: i have tried a ton of stuff on my hair, but nothing worked...i dont use any heat on it at all...
Update 2: i only try to wash my hair 2 times a week...i dont use a straightener or color my hair...i just shampoo & condition...& put stuff on afterwards...
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