Your subscription is set up to bill and ship on approximately the same date each month, which will prevent you from running out of products.
For example, if you ordered a box on January 1 and the package arrives on January 15, you would be using the products over 30 days from January 15 – February 15. Your subscription, however, would renew on February 1 and will arrive by February 15, right on time to replenish your supply!