A device and method for treating and preventing plantar fasciitis includes a wedge adapted to be placed under the big toe. The wedge has a top surface for supporting the big toe, a first support surface separated from the top surface by a first angle, and a second support separated from the top surface by a second angle. The first and second support surfaces are perpendicular with each other so that one rests on the floor and the other serves as a backstop. The wedge has a first position for inclining the top surface upwardly at the first angle to provide moderate stretching of the plantar fascia, and a second position for inclining the top surface upwardly at the second angle to provide maximum stretching. The first angle is within a range of 20 to 25 degrees, and the second angle is within a range of 65 to 70 degrees.