Omar K. Mahmassani, DDS
A healthy Mouth is part of a healthy Body.

Your Oral health and your smile is our specialty when you visit our office. We welcome you to our office and appreciate the opportunity to provide you with complete and comfortable Dental care in Frederick County Maryland. Our staff is made up of qualified professionals who work together as a team to bring you the highest quality treatment in a warm, caring atmosphere. Our goal is to provide comprehensive Dental care with special attention given to individual needs. We pride ourselves on being sensitive to your needs and the needs of your family. Our philosophy is to strive for excellence in the quality of Dental care in the most comfortable surroundings.

Outstanding Dental skills, experience and compassion are necessary ingredients in providing exceptional patient care. Our dedication to continuing education allows us to stay up to date on the latest advancements in Dentistry. This results in offering the most current and advanced treatment options for our patients. As professionals, we value the trust that our patients have placed in us. We recognize the uniqueness of every individual patient and we treasure the unique relationships we establish with our family of patients.

Educating our patients serves as a part of our commitment to informed decision making for our patients's oral health needs. This website is one of many resources available for information and communication with us. It is our hope that you’ll find both useful and informative. We appreciate the time you’ve taken to visit this site and find out more about our Dental practice, our team, and the many services we can provide to help you achieve optimum oral health.

Please browse through our website and be sure to give us a call if you have any questions or would like to schedule an appointment.

Omar K. Mahmassani, DDS
5910 Frederick Crossing Lane Suite 101
Frederick, MD 21704
Phone: 301-662-4422

Meet the Doctor

  • Dr.

    Dr. Mahmassani has been practicing in Frederick, Maryland since 1991. He received his Bachelor of Science degree in 1985 from The American University in Washington D.C. and his Doctor of Dental Surgery in 1989 from Georgetown University.

Featured Articles

Read about helpful topics

  • Your Rights and Responsibilities as a Patient

    Patient Rights You have a right to choose your own dentist and schedule an appointment in a timely manner. You have a right to know the education and training of your dentist and the dental care team. You have a right to arrange to see the dentist every time you receive dental treatment, subject to ...

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  • Crowns and Bridges

    Bridges Bridges are natural-looking dental appliances that can replace a section of missing teeth. Because they are custom-made, bridges are barely noticeable and can restore the natural contour of teeth as well as the proper bite relationship between upper and lower teeth.Bridges are sometimes referred ...

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  • Veneers

    Teeth that are badly stained, shaped, or crooked may be improved by a veneer placed on the surface of the affected teeth.Veneers are thin pieces of porcelain or plastic cemented over the front of your teeth to change their color or shape. Veneers are used on teeth with uneven surfaces or that are chipped, ...

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  • Invisalign®

    Invisalign's® invisible, removable, and comfortable aligners will give you the beautiful straight teeth you've always wanted. And best of all, no one can tell you're wearing them. Invisalign® is great for adults and teenagers. What is Invisalign®? Invisalign® is the invisible way to straighten your ...

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  • Fillings

    Frequently asked questions: dental fillings Are dental amalgams safe? Is it possible to have an allergic reaction to amalgam? Is it true that dental amalgams have been banned in other countries? Is there a filling material that matches tooth color? If my tooth doesn't hurt and my filling is still in ...

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  • Sealants

    Sealants are liquid coatings that harden on the chewing surfaces of teeth and are showing a great deal of effectiveness in preventing cavities—even on teeth where decay has begun. The pits and grooves of your teeth are prime areas for opportunistic decay. Even regular brushing sometimes misses these ...

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  • Overview

    Pain can occur in any number of places in your mouth: teeth, gums, roots, the palate, tongue and jaw. Cavities are a common culprit causing pain. Untreated cavities can impact nerves because of infections of the tooth and gums. Impacted and abscessed teeth and sore jaws from teeth grinding are other ...

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  • Toothaches

    Simple toothaches can often be relieved by rinsing the mouth to clear it of debris and other matter. Sometimes, a toothache can be caused or aggravated by a piece of debris lodged between the tooth and another tooth. Avoid placing an aspirin between your tooth and gum to relieve pain, because the dissolving ...

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  • Scaling and Root Planing

    Some cases of acute periodontal (gum) disease that do not respond to more conventional treatment and self-care such as flossing may require a special kind of cleaning called scaling and root planing. The procedure begins with administration of a local anesthetic to reduce any discomfort. Then, a small ...

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  • Medications

    Some dental procedures, such as tooth extractions and oral surgery, may call for our office to prescribe medications before or after a procedure. These medications are used to prevent or fight an infection, or to relieve any post-operative discomfort and pain. For these reasons, it is extremely important ...

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What Our Clients Say About Us

  • "This was my dentist from ages 4-22 and I am now 32 and miss him and the staff so much! Such a gentle hand and sweet staff! The office is very nice and clean not to mention very classy! Unfortunately I had to switch dentist (his office no longer accepting my insurance) now I have really understood why so many people are scared of going to the dentist! I was never scared or had any bad experiences until going to a different dentist and wow I really wish I could afford to go to doctor Omar again! Best dentist!!"
    Lauren R.
  • "Highly recommend this dental office. From the front desk to the technicians to Dr Mahmassani, I always have a terrific experience. Friendly, knowledgeable, concerned with your needs, on time and efficient. I have had issues beyond the typical teeth cleaning and checkup....and I have always felt a strong degree of confidence in the work done."
    Michele P.
  • "I was a patient from out of town. It was very easy for new patients. You can fill out your insurance/medical history online so you're ready when you arrive. All staff were not only professional and skilled, but also very personable and informative about what exactly is going on my mouth (maybe I just like knowing). I would recommend this practice to anyone. Excellent!"
    Aaron D.
  • "I absolutely love the staff! They always have the biggest (and brightest) smiles on their faces when I walk through the door. My 5-year-old-self hates me for saying this but I genuinely enjoy going to the dentist now."
    Claire K.
  • "We have been patients for over 30 years because they are the BEST.
    Our children had sealants when very young and have NO CAVITIES!
    From the front desk to the Hygenists to the assistant (surgical) nurse to "Dr Omar" it's a fabulous team approach!"
    Cecilia G.

Our Location

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Hours of Operation

Our Regular Schedule

Omar Mahmassani, D.D.S.


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm