O esmalte de unha é seguro para uso repetitivo em clientes porque "não pode armazenar agentes patogênicos"?

This is true. Esmalte para unhas can be used on multiple clients using the same pincel. and no other hygiene requirements.

This is because nail esmalte is packed full of solventes. (how it dries), so is not an environment that any patógeno can survive (possibly with the exception of a fungo as fungal spores can survive many environments).

However, even though this is true, it is not in the profissionais de unhas’ remit to work on unhas não saudáveis.