The ornamental design for dental air scaler, substantially as shown and described.
FIG. 1 is a perspective view of a dental air scaler, showing my new design;
FIG. 2 is a side elevation thereof. The undisclosed side is identical;
FIG. 3 is a top end plan view thereof; and
FIG. 4 is an opposite bottom end plan view thereof. The broken line showing
of attachments at either end of the dental air scaler is for illustrative
purposes only, and forms no part of the claimed design.