Do you say Lice is or lice are?

Lice is the preferred grammatical choice.

This is because "lice" is the plural form of the noun "louse." When referring to a group of lice, it is correct to use the plural form of the noun, which is "lice."

For example:

- "I found lice in my hair."

- "The child has head lice."

In these sentences, "lice" is used as the plural form of "louse" to indicate that multiple lice are present.

While some people may use the phrase "lice are" colloquially, it is not considered grammatically correct because "are" is the plural form of the verb "to be" and should only be used with plural subjects.

Therefore, when referring to a group of lice, "lice is" is the correct grammatical construction.