The ornamental design for a foldingtoothbrush with a replaceable head, as shown and described.
FIG. 1 is a top-down view folding toothbrush with a replaceable head;
FIG. 2 is a bottom-up view of a folding toothbrush with a replaceable head;
FIG. 3 is a front isometric view of a folding toothbrush with a replaceable head in a closed orientation;
FIG. 4 is a front isometric view of a folding toothbrush with a replaceable head in a partially open orientation;
FIG. 5 is a front isometric view of a folding toothbrush with a replaceable head in an open orientation;
FIG. 6 is a back isometric view of a folding toothbrush with a replaceable head in a closed orientation;
FIG. 7 is a back isometric view of a folding toothbrush with a replaceable head in a partially open orientation;
FIG. 8 is a back isometric view of a folding toothbrush with a replaceable head in an open orientation;
FIG. 9 is an exploded front isometric view of a folding toothbrush with a replaceable head in an open orientation with the replaceable head pulled out.
FIG. 10 is an isometric view of a folding toothbrush with a replaceable head in a partially open orientation; and,
FIG. 11 is an isometric view of a folding toothbrush with a replaceable head in a partially open orientation.