It is a good idea to have your orthotics re evaluated at least once a year by your podiatrist.  There are some indications you need a new pair, for example if the top cover is worn out or the bottom appears worn.   The shell may need to be replaced, as heat, weight-bearing, and wear and tear may take its toll and may not longer be giving you enough support.  Some of our patients come in becaus their symptoms are slowly returning, and often the cause is that the orthotics are worn and no longer providing adequate support.  So although your orthotics may appear to be in good shape, it is a good idea to have them evaluated at least once a year.