Method for obtaining a fan-like nail brush, said method comprising the steps of: a) arranging a brush comprising: • a plastically deformable handle; • a multiplicity of hairs; • a seat obtained at one end of said handle for housing said hairs and connecting said hairs to said handle, said seat comprising a cylindrical cavity accessible through a circular opening, said cavity being delimited by a circular base opposite said opening and by at least one side wall made of low density polyethylene and having a thickness of 2 mm, said hairs penetrating said cavity, starting from said opening, at a first section thereof; b) compressing said handle transversely with respect to said side wall and at a second section adjacent to said opening and placed at a predefined distance from said base, said second section having a length equal to 1/3 the distance between said opening and said base, said compression being of 6 N/mm 2 so as to plastically deform said handle increasing the eccentricity of said opening and of said base, said compression causing a flattening of said seat at least at said second section, due to said flattening, said side wall assuming, at least at said second section, a conformation that is diverging starting from said base, said multiplicity of hairs coming to be compressed by said deformed side wall so as to assume a conformation that is diverging starting from said base with an angular width of 18°. a) arranging a brush comprising: • a plastically deformable handle; • a multiplicity of hairs; • a seat obtained at one end of said handle for housing said hairs and connecting said hairs to said handle, said seat comprising a cylindrical cavity accessible through a circular opening, said cavity being delimited by a circular base opposite said opening and by at least one side wall made of low density polyethylene and having a thickness of 2 mm, said hairs penetrating said cavity, starting from said opening, at a first section thereof; • a plastically deformable handle; • a multiplicity of hairs; • a seat obtained at one end of said handle for housing said hairs and connecting said hairs to said handle, said seat comprising a cylindrical cavity accessible through a circular opening, said cavity being delimited by a circular base opposite said opening and by at least one side wall made of low density polyethylene and having a thickness of 2 mm, said hairs penetrating said cavity, starting from said opening, at a first section thereof; b) compressing said handle transversely with respect to said side wall and at a second section adjacent to said opening and placed at a predefined distance from said base, said second section having a length equal to 1/3 the distance between said opening and said base, said compression being of 6 N/mm 2 so as to plastically deform said handle increasing the eccentricity of said opening and of said base, said compression causing a flattening of said seat at least at said second section, due to said flattening, said side wall assuming, at least at said second section, a conformation that is diverging starting from said base, said multiplicity of hairs coming to be compressed by said deformed side wall so as to assume a conformation that is diverging starting from said base with an angular width of 18°.