Check it yourself!

No one is better than you at judging when you should come in for tuning:

No longer able to execute any good carving turns on an icy slope?

 -> Your edges are dull and rounded. Time to have your edges ground!

Too little speed on gentle slopes?

 -> Your base is dry and damaged. Time to have the base refurbished!

Your skis or board judder on long sliding sections.

 -> Have the base profile stone gound now!

Binding adjustment at least ONCE PER SEASON