>>33048913>how important is a girls hair to guys?Less important than face or body, in terms of looks. But important enough that if a woman shaved it all off, she'd lose a lot of her visual appeal to men.
>do they even care?Yes. Every guy is going to have preferences about hair color, hair style, hair length, type of hair, etc. It's generally not at all a deal breaker. But if you find out his favourite hairstyle/length, or specifically the hairstyle/length he likes to see on you the most, you can score some bonus points with him by doing it for him. On occasion, regularly, whichever.
>do they notice?If it's like yours, yeah. Guy's are going to notice it's shiny, and well kept.
The same is applicable to practically every other aspect of grooming and hygiene. People are going to notice if your hair isn't brushed, conditioned, generally cared for, etc. A guy might not think to themselves specifically "This girl was lazy with her hair." But they can intuit what looks "good", and what looks "bad". And they are for sure going to notice if you've got a rat nest for hair.
Beyond looks, people who put effort into grooming tend to give off a different air than people who don't. They're perceived differently.
In conclusion; don't neglect your hair, or any aspect of your looks, grooming, and personal hygiene. Every bit of it makes a difference in your appearance, appeal, and the way you're perceived by others.