Can a cuspid be used as an anchor on a 2 tooth upper bridge ?

Cuspids have big roots and are good anchors for bridges.  If it is a virgin tooth (not already crowned or massively filled), I would be sure to get a consult about implants before you  get it cut down for a bridge that involves using a full crown on it.

Yes, the canine can be used to anchor a 2 pontic bridge as long as its is in good shape. If the tooth is broken down, then you'll need to add in more teeth to support the bridge, or get an implant or partial.