[header] How to make hair straight naturally for men [title] Mix 1/2 cup (236 ml) of milk and 1/2 cup (236 ml) of water together. [step] Mix the ingredients in an empty spray bottle so that you can easily apply the mixture to your hair. You can use cow's milk, almond milk, or coconut milk for the solution. 
Shake the spray bottle vigorously to incorporate the ingredients. [substeps] This method will relax slightly wavy hair, but won't straighten kinky or very curly hair.