The Costco Gas Station hours are usually longer than the Costco Warehouse opening hours, so make sure that you are viewing the Costco Gas Station hours, and not the Store Hours, if you search through an app or with google maps.
All dental hygienists in the United States must be licensed by the state in which they practice, after completing a minimum of two years of school and passing a written board as well as a clinical board exam. State requirements vary by state, and are controlled by state dental boards.
If applicable, a certification of licensure from each state in which applicant currently holds or has held a dental or dental hygiene license. The certification should state that your license is in good standing; appropriate signatures and embossed seal of the certifying Board are needed for validation.