Final answer:
The safe nail condition to work with in a salon is onychophagia, known as nail-biting.
Explanation:
Onychomycosis is a fungal infection of the nails, while onychophagia refers to nail-biting. Among the given options, the nail condition that is safe to work with in a salon is onychophagia as it does not present any risk of infection to the person handling the nails.
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