For relaxed and gentle oral care, visit Austin's John Jacob Valkenaar, a professional and highly-rated dentistry. Get the smile you want by coming in today. This dental clinic offers such services as check-ups. To avoid lines and accommodate guests in a timely manner, this dental clinic serves all guests on an appointment-only basis. John Jacob Valkenaar is waiting to check your oral health, fill your cavities, and shine your pearly whites.