Plural for hair

hair itself. Some people say "hairs" & that is wrong.

yeah, I have a blond hair and a brown eye. Typical first level mistakes.

Don't you use 'hairs' when you want to refer to hair strands as individual objects in a group, as opposed to the whole of someone's hair?
As in 'I have split hairs'.

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i really dont know
i have been looking everywhere on the web

but i think 

you know how deer is same plural and singular same with fish

i think this is one of those kind of nouns

Hair is both singular and plural. The hair on your head refers to all the individual hairs.

It depends on whether "hair" is used in its countable or uncountable sense. See below from WikiAnswers

BE CAREFUL with the noun 'hair' which is normally uncountable in English:

She has long blonde hair

It can also be countable when referring to individual hairs:

My father's g

Hair is both singular and plural. and it's better to use hair, not hairs which is totally wrong. just like you can not say works, or sheeps, or fishes. These words are both singular and plural.

Your head is what is on your head. Eg, I have long hair.

A hair is a strand of hair. Eg. There are some hairs on your dress.