To provide a strength reinforcement brush further enhancing elasticity and flexibility, and to provide a deburring/polishing/cleaning method using this.

In the strength reinforcement brush, a plurality of brushes are tied up in a groove formed on a brush base body, and a plurality of bundles of brushes stored in a cylindrical body formed from a pivotable coil spring are implanted at an arbitrary interval. In the deburring/polishing/cleaning method, deburring/polishing/cleaning is performed while the bundle of brushes in which the plurality of brushes of the strength reinforcement brush are tied up is pivoted by the coil spring surrounding this using the strength reinforcement brush.