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Knowing the difference between lice and dandruff can help heal your scalp condition properly. Lice are infectious parasites and dandruff is a self-contained scalp condition. Dandruff comes from the head, and flakes off. Dandruff is due to the excessive shedding of dead skin cells from the scalp, and lice are wingless insects (small bugs) that infest the hair and scalp. The methods of prevention and treatment also vary between lice and dandruff.
It is not true that lice has a relationship with dirty hair and human who have poor personal hygiene. They are not belonging where they live. All they need is a warm head of hair and a scalp. Even you have clean head, you still can be infected by head lice just because sharing personal items with somebody who get lice.