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

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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

  • 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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  • Smile Makeover

    Smiling with confidence makes you feel great. A beautiful smile is also an important social and professional asset. Yet there are many people who avoid showing their teeth in public or in photographs because they don't like what they see. If that describes you, then why not start the process of getting ...

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  • Periodontal (Gum) Disease

    While you may think that some loss of teeth is inevitable with aging, it is actually possible for all of your teeth to last a lifetime. One of the ways you can achieve this goal is to avoid periodontal disease (“peri” – around; “odont” – tooth), which is caused by bacteria that attack the ...

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  • Mouthrinses

    Numerous studies have shown that using an appropriate mouth rinse, in conjunction with regular brushing and flossing, is an easy and effective way for you to improve your overall oral health. As part of a regular program of oral hygiene, mouth rinses (which are sometimes called mouthwashes) can be effective ...

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  • Oral Hygiene for Kids

    Teeth can last a lifetime if you take care of them right — and the best time to start is just as soon as they begin appearing. By establishing good oral hygiene routines for your children right from the start, you'll give them the best chance of keeping their teeth healthy — forever. Tooth decay, ...

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  • Invisalign for Teens

    There's a new technology that's (literally) putting a smile on plenty of young faces: A system of clear, removable aligners made especially for teens called Invisalign Teen®! If you (or a teenager you know) are a candidate for this treatment, you might find it's the best fit for your lifestyle: It lets ...

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  • Fillings

    If you have never had a cavity, congratulations! If you have had one, you are not alone. About 78% of us have had at least one cavity by the time we reach age 17, according to a 2000 report by the U.S. Surgeon General. Fortunately there's a time-tested treatment for cavities: the dental filling. Fillings ...

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  • Orthodontic FAQs

    What do orthodontists do? Orthodontists are dental specialists who diagnose and treat problems with the position, alignment or spacing of the teeth, and related irregularities in the face and the jaw. A number of special treatments, including braces and other oral appliances, are used to correct these ...

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  • Sinus Surgery

    If you want to replace a missing or failing tooth with a state-of-the-art dental implant (watch dental implant video), your dentist will first need to make sure that you have sufficient bone in your jaw to anchor the implant. This is true no matter what type of tooth is being replaced. However, if it ...

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  • Tips to Prevent Cavities

    Cavities are little holes in teeth that can eventually cause big problems. They form when tooth-eroding acid attacks a tooth's protective outer covering (enamel). This acid mainly comes from two sources: your diet, and certain oral bacteria that thrive in the absence of effective oral hygiene. If cavities ...

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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