No, it is generally not recommended to share hairbrushes. The primary way head lice spread is through direct head-to-head contact with an infected person. Lice prefer the warmth of a human scalp and don't travel far from their host. However, in extremely rare instances, sharing a brush with someone who has lice could lead to an infestation. This can happen if nits (lice eggs) are present on the brush and subsequently transfer to your hair.