Welcome to Our Practice

Welcome to Altmark Kidz Dentistry, Your Dentist in Commack, NY

Welcome! The dental professionals at Altmark Kidz Dentistry are pleased to welcome you to our practice. We want all our patients to be informed decision makers and fully understand any health issues you face. That's why we've developed a website loaded with valuable information about dental problems and treatments. We encourage you to visit this site whenever you have concern about your teeth.

Our website also provides you with background about our staff, office hours, insurance policies, appointment procedures, directions to our office and other useful information. We know how hectic life can be and are committed to making our practice convenient and accessible. We want you to feel confident that you're working with doctors and other professionals who are qualified, experienced and caring.

Please take a few moments to look through this site to get a better feel for Altmark Kidz Dentistry's capabilities and services. We also invite you to email or call our office at any time to request an appointment or ask any questions. Thank you.

  • We strive to treat even even the most fearful kids with TLC and can provide laughing gas and treatment under general anesthesia, if necessary.
  • We treat patients under general anesthesia at Catherine of Sienna Medical Center in Smithtown.
  • We treat special needs patients and we offer nitrous oxide (laughing gas).

Contact Us

Meet The Doctor

  • Dr. Jonathan Altmark

    Dr. Jonathan Altmark has been in practice for over 20 years. His main goal is to provide quality dental care to all children regardless of how scared they may be!


    My daughter has been coming here for a few years and I love her dentist. He is very patient and nice. I wouldn't go anywhere else.


    Outstanding service!! Super nice and friendly. Always clean and never experienced issues! Definitely recommend it!!


    Highly recommend this office, I have been going here since i was a little girl. He always makes sure the parents and patients understand what is being done to their child. Treats every patient as if they were his own, and genuinely cares about their dental hygiene. All of their Hygienists are very nice and patient with kids, they always inform the parents and patients of good oral hygiene.


Featured Articles

Read up on informative topics

  • Bridges

    When you lose a tooth, it affects not just the appearance, but the function of your smile. It can be difficult to eat or speak naturally, extra stress is put on your remaining teeth, you’re at greater risk for developing gum disease, your remaining teeth can shift out of position causing bite problems, ...

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  • Orthodontic Retention

    Getting your braces off is definitely a cause for celebration. You can finally enjoy your new smile after all that work and effort! But getting your braces off isn’t the end of treatment. Once your braces come off, you will enter the retention period of treatment. During the retention period, you will ...

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  • Inlays and Onlays

    Inlays and onlays are indirect restorations used to repair molars and premolars damaged by decay or trauma. Inlays and onlays fit more securely and last longer than fillings, strengthen compromised teeth, and preserve more natural tooth structure than crowns. An inlay is used to restore the center of ...

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  • 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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Our Location

Hours of Operation


9:00 am-5:00 pm


9:00 am-5:00 pm


9:00 am-5:00 pm


9:00 am-5:00 pm


9:00 am-5:00 pm




8:00 am-1:00 pm