How can we help?


I need a tooth restored

Our doctors offer cosmetic dentistry options that perfect your smile & restore your confidence.

I have trouble sleeping

Sleep apnea shortens lives, stresses relationships, & lowers quality of life. Timonium Dentistry offers alternatives for CPAP intolerant patients.

I want straighter teeth

Invisalign brings stealth straightening to you with thin, invisible trays. Timonium Dentistry’s experience puts a stunning smile within easy reach.

Why Choose Us?

With our convenient location in Timonium, MD, we care for patients from Lutherville-Timonium, Baltimore County, and the surrounding area.

Our dedicated team and compassionate doctors manage everything from cleanings and exams for the whole family to sleep apnea appliance fabrication, implant placement and restoration, Invisalign, and more.

At Timonium Dentistry, we care for our patients like family, offer custom treatment plans, and work with our patients to make sure they are comfortable and cared for.

We provide quality dental care, conveniently in your neighborhood and cater to your schedule by offering early morning appointments and extended hours on Wednesday evenings. Because your comfort is important to us, we offer many of the modern amenities you’ve come to expect in a dental office. We believe that whatever your dental needs may be, you will be treated with the highest quality dentistry available and with the most compassionate, respectful care you deserve.

Meet the Dentists

Mark Ballinger, DDS

Dr. Mark Ballinger is a native of New Prague, Minnesota. He attended St. John’s University in Minnesota and was awarded his D.D.S. degree in 1969 from the University of Minnesota. Upon completion of his dental degree, He completed a 2 year residency in general dentistry and went on to serve ten years on active duty in the U.S. Army Dental Corps.


Thomas Stack, DDS

Dr. Thomas Stack is passionate about improving the oral health of his patients. Upon completing his doctorate of dental surgery at the University of Maryland he completed his training through a general practice residency at Christiana Hospital the following year. He then served in the National Health Service Corps for six years, primarily as the director of a clinic in downtown Baltimore providing dental care to the homeless population. He is a member of the Academy of General Dentistry, the International Congress of Oral Implantologists and the American Academy of Implant Dentistry.


David Knopf, DMD

Dr. David Knopf was raised in New Haven, Connecticut. He received both his undergraduate and dental degrees from the University of Pittsburgh, being awarded a D.M.D. in 1973. Dr. Knopf spent 7 years on active duty in the U.S. Army Dental Corps completing both a 1 year general dentistry residency and a Master’s of Education awarded by the University of Southern California.