The invention relates to a false nail comprising at least: one front layer (12) forming the body of the false nail (1), and a rear layer (11) of an adhesive material for attaching the body of the false nail to a natural nail. The rear layer (11) is formed by a fast-drying polymer adhesive with desiccating capacity, and the front layer (12) is made of a composite material and comprises at least a first layer (12a) of micro-hybrid composite with low contraction capacity in contact with the polymer adhesive. The invention also relates to a method for shaping the false nail on a natural nail and the use of composite material to shape same.