1. Prepare crown prep as usual

Insert the darker side of the PrepCheck tab between the preparation and the opposing dentition.
Pull or tug on the PrepCheck tab. The PrepCheck should slide out with very little resistance. If it does not, proceed to step 2. (If the tab cannot be removed or is difficult to remove, adequate reduction has not been achieved.)

2. Ask patient to bite on the PrepCheck tab

Insert the lighter side of the PrepCheck between the preparation and the opposing dentition.
Note: the lighter side contains the powdered marking medium. Ask the patient to tap or grind on the PrepCheck.

3. Look at occlusal contacts on adjacent teeth

Reduce the areas that mark. Go back to step 1 and tug with the uncoated side of PrepCheck between the preparation and opposing dentition.