At the moment there a no scientific evidence that rinsing your hair with cold water will have any positive effect on your hair.
However, rinsing your hair with cold, warm or hot water can have some effect. But it won’t drastically change whether your hair cuticle will be more open or closed.
There are many people that believe that rinsing your hair with cold water closes the hair cuticle and therefore you will retain all the moisture and keep your hair shiny. But it should be your conditioner that penetrates deep into the scalp to enrich, nourish and to close the hair cuticle.
-Sources that we used –
Hairlavie – https://tinyurl.com/yxryzrde
Allure – https://tinyurl.com/y56y6av9
Naturallycurly – https://tinyurl.com/yxgqqpbs
Theouai – https://tinyurl.com/y352cprq
Philipkingsley – https://tinyurl.com/yy9xk4ek