How many years do orthotics last?
While a typical custom orthotic might last around 2-3 years on average, not every case is a typical one. Some people need theirs replaced every year, while others can get 5 years or more (occasionally much more) of use out of theirs.
How do you know if your orthotics are worn out?
If your pain is back, that's an obvious indication of your orthotics' inability to treat it any longer. You shouldn't feel any pain while standing or running with orthotics, and if there's formation of calluses and corns all over the sole, that's how you know the orthotics are worn out.