1) If you are in pain - If you are experiencing the same symptoms you felt before receiving your orthotics or if you’ve developed new pain or discomfort in your feet, ankles, knees, or back this is a strong indicator that your orthotic is no longer functioning as it should.
2) You’re developing calluses or corns -Corns usually form because of friction between your foot and your footwear and calluses are a response to repetitive pressure on one spot. If this is happening, chances are your orthotic is wearing out.
3) There’s visible damage -If you examine your orthotics and find places that appear thin and worn down or if you find any cracks in the materiel or pieces have broken off, it’s time to get them replaced.
4) You notice uneven wear on your shoes -Orthotics are designed to correct biomechanical issues with your feet. Shoes that are wearing more in one spot or on one side can mean that your feet are no longer properly aligned, and your weight is not being distributed evenly and therefore time to replace your orthotics.