The BB (or best by date) is a general indication of overall product performance expectations.
It is NOT an expiration date (like what you find on food or medicine). However, you may observe the following:
Viscosity or thickness can decrease over time
It does not mean that your product is no longer safe or fresh it is a suggestion based on the performance of the products over time.
Please keep in mind that the preservatives in our products, that contain water, do deteriorate over time, so we do not recommend keeping products such as those laying around for years after the BB date has passed.