Hawthorn Dental Address 4113 Union Road St. Louis, MO 63129 Phone 314-487-0200 Hours of Operation Monday: CLOSED Tuesday: 8:30 AM – 6:00 PM Wednesday: 7:30 AM – 5:00 PM Thursday: 7:30 AM – 5:00 PM Friday: 7:30 AM – 3:30 PM Book Online To navigate, press the arrow keys. Contact Us First Name * Required Last Name * Required Phone * RequiredEmail * Required Message