My friend a dental tech. he says i have largest impression he ever took in 20 years. does this mean i have a large jaw?

Maybe: Or maybe your friend has only worked on impressions that were smaller than yours. Can't really tell without visualization.

Jaw: It really doesn't matter what size jaw you have. We, human come in different shapes and sizes.

Large Jaw: It's all relative. If your jaw is proportional to the rest of your face, it is considered normal.

Size doesn't matter: With individualized trays, the dental technician produces an individual impression tray customized to your jaw. In order to do this, a pre-impression is initially taken. This is helpful in case of difficult jaw conditions like very large/small jaws, after tumor surgeries and atypical anatomical shape, etc. The quality and accuracy of the dental impression is more important than the size.