The 4 oz jar seems like it's not going to be enough??

A little really goes a long way! The 4-ounce scrub tub is the perfect size if you plan to use the scrub on your face and neck area. Yes, the Original Butt Scrub line is gentle enough for the face, it won't clog your pores. It washes away leaving your skin moisturized, soft, and supple, never oily. You only need to use a pea sized amount if treating a small area. Simply add a little warm water and rub in a circular motion. The 4 oz scrub tub should last you 3 months or more. The 6-ounce scrub tub is perfect for larger areas and the 16-ounce large scrub tub, when available, is perfect for the full body experience.