Interdental Brush

FIG. 1 is a front, right and bottom perspective view of an interdental brush, showing my design. FIG. 2 is a front elevation view thereof. FIG. 3 is a rear elevation view thereof. FIG. 4 is a left side elevation view thereof. FIG. 5 is a right side elevation view thereof. FIG. 6 is a top plan view thereof. FIG. 7 is a bottom plan view thereof; and, FIG. 8 is an enlarged view of detail 8 in FIG. 4 . The dot-dash broken lines in FIGS. 4 and 8 depict the boundaries of the enlargements that form no part of the claimed design.