Notwithstanding any other provision of law to the contrary, any qualified dentist who is legally authorized to practice pursuant to the laws of another state may practice as a dentist in this state without examination by the board or payment of any fee and any qualified dental hygienist who is a graduate of an accredited dental hygiene school and legally authorized to practice pursuant to the laws of another state may practice as a dental hygienist in this state without examination by the board or payment of any fee, if such dental or dental hygiene practice consists solely of the provision of gratuitous dental or dental hygiene services provided for a period of not more than fourteen days in any one calendar year. Dentists and dental hygienists who are currently licensed in other states and have been refused licensure by the state of Missouri or previously been licensed by the state, but are no longer licensed due to suspension or revocation shall not be allowed to provide gratuitous dental services within the state of Missouri. Any dental hygiene services provided pursuant to this section shall be performed under the supervision of a dentist providing dental services pursuant to this section or a dentist licensed to practice dentistry in Missouri.