Welcome to Our Practice

South Gate Dental: Serving The Loudoun County and Leesburg, VA  Area

Dentist Leesburg, VA

Dr. Knapp Heisey remains dedicated to providing the best and most up-to-date treatment for her patients. As such, she continues to keep herself current on dental practices and procedures so that she can provide the best care possible for her patients.

By incorporating an interceptive approach, we are able to offer integrative dental care and bring together those factors of health, stability and function, with comfort and appealing aesthetics.

At our Leesburg dental practice, you can expect an interceptive, integrated approach to your oral health care needs. It has been our experience since 1983 that by using this approach we have been able to achieve an extremely high level of success.

Patients are taught to understand the most common factors that can potentially lead to a less than ideal state of dental health. With the appropriate oral health education and the presentation of one or, when indicated, several dental treatment plans the very best care for each person's circumstances will be provided.


  • Cosmetic Contouring
  • Cosmetic Dentistry
  • Crowns and Bridges
  • Dentures
  • Extractions
  • Grafts
  • Implants
  • Endodontics
  • Dental Sleep Medicine
  • Esthetic Dentistry
  • Pediatric Dentistry
  • Professional Cleanings
  • Oral Surgery
  • Orthodontics
  • Root Canal Therapy
  • Scaling and Root Planing
  • Sealants
  • Specialty Dentures
  • Veneers
  • Teeth Whitening
  • Restorative Dentistry

History & Awards

Our practice has been located here in Loudoun County for over 25 years. We have patients from Leesburg, Hamilton, Purcellville, Ashburn, Sterling, and all around Loudoun County, and we would love to meet you!

From first contact at South Gate Dental, our Loudoun County dentists are committed to your individual attention and strive to provide personalized oral health care tailored for your unique dental needs and goals. We work hard to create the ultimate stress-free and comfortable dental experience. Your health and comfort are our top priorities, and we do what it takes to help every patient understand their symptoms and treatment options in a relaxed office setting.

It is our mission to educate and provide our patients with the best dental care in Loudoun County. For that reason, we've designed this website to provide you with all of the important information you need to make healthy decisions about your teeth and gums. We encourage you to browse our office page, service details, and patient education library whenever you have a question about our practice or your oral health.

Achieving quality dental care shouldn't be difficult, so at South Gate Dental we make it simple to achieve your healthiest, most beautiful smile. Whether you are looking for information on Implant restoration, Teeth whitening, Veneers, or Sleep apnea you can learn more about all of your options from our services page. For your convenience, you can also request an appointment online with our Leesburg dentist and download patient forms directly from our website.

Feel free to contact our Leesburg, VA dentist office with any questions. We look forward to making each visit to our office a positive experience.

Meet Our Dentist

Learn Who We Are

  • Dr.
    Tammy Knapp Heisey D.M.D.

    Dr. Tammy Knapp Heisey was born and raised in a small town in Southwestern Pennsylvania, Central City. From a family of ten children she grew up with values of importance of family, working hard, and helping others. 

    Learn more about the dentist here


We look forward to hearing from you.

    Great experience. In and out in a reasonable amount of time.

    Darnell Branch

    Always a pleasant experience receiving expert and thorough attention to services provided. Thank you.

    M Clulow

    Always a pleasant experience receiving expert and thorough attention to services provided. Thank you.

    M Clulow

    Professional very nice no long waits... I love coming here.

    Chenel Moore

    I have gone to southgate dental for many years,it has been awhile since my last visit.i returned today and everyone was professional and very nice.


Featured Articles

Read about helpful topics

  • Dental Implants

    If you have recently dealt with an injury or disease that affected your oral health, there are options available to recover the smile you once had. You may even be able to achieve a better smile than the one you had. Dental implants make it possible to renew your smile if you have lost some teeth. There ...

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  • Tooth Decay Prevention

    What is tooth decay? Tooth decay begins with the Streptococcus mutans bacteria. These bacteria join with food particles and fluids in the mouth to create plaque, a constantly forming biofilm which sticks to the surface of tooth enamel. The bacteria in plaque convert the sugars in our foods into lactic ...

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  • Root Canal Treatment

    Every tooth has two sections: a crown, the visible part of the tooth above the gum line, and one or more roots, which anchor the teeth within the jaw. Each tooth has three basic layers: an outer layer of hard enamel (which protects the crown) or cementum (which covers the root), a middle layer of softer ...

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  • Fillings

    The bacteria in plaque produce acids that erode tooth enamel, eventually creating a hole, or cavity, in the tooth surface. Left untreated, this decay can spread to the interior of the tooth, and might lead to the need for a crown, a root canal, or even extraction. When caught early, your dentist can ...

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  • Veneers

    A dental veneer is a thin, durable porcelain shell that is custom-fabricated to cover the front of a tooth. Veneers can restore the appearance of teeth with chips, cracks, and stains, can close small gaps between the teeth, and can reshape misshapen or slightly misaligned teeth. Veneers are a popular ...

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  • Educational Videos

    Take a few minutes to watch our educational videos and learn more about different dental treatments and procedures. Video topics include general & cosmetic dentistry, Implants, oral health and hygiene, orthodontics and preventative dentistry. ...

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  • Laser Decay Diagnostics

    Using lasers, dentists can detect tooth decay that is not yet visible and would otherwise be undiagnosed using traditional methods. Laser cavity detection is based on the fact that healthy tooth structure reflects light, or “fluoresces,” differently than does decayed tooth structure. Teeth with decay ...

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  • Laser Dentistry

    Lasers direct a controlled force of energy that can remove or alter bone and tissue. By applying varying wavelengths of energy, dental lasers are used to detect and treat a myriad of oral health issues, including detecting oral cancer and treating small cavities. There are two different types of dental ...

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  • Same-Day Crowns

    A tooth that has been structurally damaged by decay or trauma sometimes needs to be crowned or “capped” so that it can look good and function properly again. A crown is a durable covering that is custom-made to fit over the entire tooth from the gum line up. Getting a crown used to mean multiple ...

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  • Digital X-Rays

    X-rays are one of the most important parts of a dental exam, and can help medical professionals detect problems long before they are visible to the naked eye, including early tooth decay, gum disease, abscesses, and abnormal growths. Benefits of Digital X-rays Easy to obtain Digital X-rays are obtained ...

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Hours of Operation

Our Regular Schedule


9:00 am-5:00 pm


9:00 am-5:00 pm


8:00 am-4:00 pm


8:30 am-1:30 pm


By Appointment