The ornamental design for a dentalsensor, as shown and described.
FIG. 1 is an isometric view of a dental sensor showing our new design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a first side view thereof; and,
FIG. 7 is a second side view thereof.
The broken line shown in the drawings is included for the purpose of illustrating portions of the dental sensor and forms no part of the claimed design.