The ornamental design for a 3 sided fingerbrush for oral hygiene, as shown and described.
FIG. 1 is a frontal view of the 3 sided finger brush for oral hygiene showing my new design
FIG. 2 is a bottom view of the invention
FIG. 3 is a top view of the invention
FIG. 4 is a side view of the invention
FIG. 5 is a frontal view of the invention; and,
FIG. 6 is a rear view of the invention.
FIG. 1 is shown on a reduced scale and the broken line showing of a user's hand therein is for illustrative purpose only and forms no part of the claimed design. The broken lines showing a series of bumps illustrate portions of the finger brush that form no part of the claimed design.