Is it okay to use two different shampoos at one time?

I have greasy hair but would also like to use a shampoo that straightens. as most straightening shampoos are for dry/damaged hair rather than oily hair, is it okay to use a greasy hair shampoo on my scalp and root area, and a straightening one on the rest of my hair?Is it okay to use two different shampoos at one time?
I dont see why not seeing as i do that myself, however it varies on different people's types of hair.





If it doesnt suit you, you could always stick to say the non-greasy shampoo (citrus shampoos are best btw) and then use a serum or sleek or anti-frizz spray on the rest of your hair after washing? John Frieda and Pantene are good, im sure theres others too.





Or, stick to the straightening shampoo and not let your hair get as greasy by cutting down on greasy food, not touch your hair with your hands so much, and adding a little talcum powder to soak up the grease and keep it dry.





Whichever suits you best, i guess.