We recommend storing the tooth whitening gel in a cool dark place. Perhaps a room temperature bathroom drawer. If stored in this way, the shelf-life of the whitening gel is approximately 1 years.Our gel is concentrated with no fillers. Therefore, you get only the beneficial ingredients with no dilution. Our specially formulated gel uniformly immerses the teeth in flowable gel. This optimized treatment delivery system yields outstanding results every time with little or no sensitivity. This makes our gel superior to most on the market. Compare our formula to Opalescence and NiteWite.