About Us

Dr. Sandra Selnick  and Dr. Ross Aronson are trusted Orthodontists in Ellicott City, Clarksville, and Columbia MD for over 30 years. Award winning specialists are closer than you think.

About OX Orthodontix

The OX team is experienced and talented with a commitment to working with you and your family to create a comfortable, stress-free, and rewarding experience every time you visit our practice.

From your first appointment to treatment completion, we are excited to make your experience a great one. Two convenient offices and early and late hours to accommodate any schedule, we know you’ll love our excellent team and orthodontists.

Thank you for voting OX Best of Howard 2020!

Our team is also recognized as Top 1% Diamond Plus Invisalign providers, this means they have treated more patients with Invisalign than any other orthodontist in the United States!

Dr. Selnick and Dr. Aronson provide braces treatments using the most advanced technology, custom orthodontic braces for children up through adults for those who want a more traditional approach.

Our Orthodontists

Dr. Mitra Derakhshan

Dr. Mitra Derakhshan has worked with Invisalign for over 10 years and has demonstrated her expertise with the clear aligner system by being published in the Journal of Clinical Orthodontics, giving seminars in orthodontics, and lecturing on orthodontic topics worldwide.

Before Dr. Derakhshan joined the OX Orthodontix team, she received her dental degree (DDS) at the University of Michigan and her master’s degree (MS) and Certificate in Orthodontics at the University of Illinois at Chicago.

Outside of the office, Dr. Derakhshan enjoys spending time with her family, traveling, exploring the outdoors, and watching a romantic comedy movie every once in a while.

Dr. Sandra Selnick

Dr. Sandra Selnick is dedicated to staying on the cutting edge of innovative orthodontic treatment to provide the best possible treatment results for her patients. Dr. Selnick takes pride in “creating beautiful smiles for all ages” using the latest advancements in orthodontic technology.

As the daughter of a pediatric dentist and a pediatrician, Dr. Selnick was bound to work as a medical professional too! She graduated with a Bachelor of Science (BS) from the University of Miami before earning her doctoral degree in dentistry (DDS) from the University of Maryland where she graduated with special recognition from the American Association of Orthodontists. After completing a hospital-based General Practice Residency with the VA Medical Center in Baltimore, Dr. Selnick’s interest in orthodontics led her back to the University of Maryland for three years of specialty training resulting in a Certificate in Orthodontics. She concurrently pursued her research in orthodontic computer analysis, earning a Master (MS) in Oral Biology.

Before joining the OX Orthodontix team, Dr. Selnick was in private practice and worked as a staff orthodontist at Children’s Hospital at Washington Hospital Center. Now she is a wonderful addition to the team of orthodontists at OX and has been a leader in using Invisalign to treat most of the patients that come to our offices.

Dr. Selnick is also dedicated to giving back to her community and her strong ties in the Howard County area are a source of pride in Dr. Selnick’s professional and private life. When she is not in the office, Dr. Selnick is active in her two children’s school activities and cheers them on in swimming competitions throughout the state.

Dr. Ross Aronson

Dr. Ross Aronson’s mission is to give you more reasons to smile. In addition to providing excellent orthodontic care, he is passionate about ensuring that all of his patients have an amazing experience throughout their treatment.

Having earned his doctorate of dental surgery at Columbia University in New York and graduating at the very top of his class, Dr. Aronson went on to complete his orthodontic specialty training at the University of North Carolina at Chapel Hill, one of the nation’s preeminent orthodontic residencies.

He is a proud member of the Omicron Kappa Upsilon Honor Society, available only to the top 10% of dentists, and was honored with the American Academy of Oral Medicine Award and the American Association of Oral Biologists Award. Dr. Aronson is also an active inventor, and has earned two patents in the dental and orthodontic fields, with a third pending.

When Dr. Aronson is not thinking up ways to make people and their teeth happier and healthier, he is likely focusing on either fitness or nutrition, so be prepared to run into him and his wife at the Columbia Association or the grocery store: two of their favorite places! In fact, Dr. Aronson worked as a personal trainer during his years as an undergraduate, and taught himself to cook as a teen. If it’s on Food Network, he’s either seen it or tried it!

Dr. Aronson is thrilled to be part of OX Orthodontix and the Howard County community.

Dr. Mitra Derakhshan

Dr. Mitra Derakhshan

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Dr. Sandra Selnick

Dr. Sandra Selnick

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Dr. Ross Aronson

Dr. Ross Aronson

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Our Team

Find out more about the team who’ll be looking after you during your orthodontic treatment journey at our offices in Columbia/Ellicott City and Clarksville/River Hill.

We work hard to train and learn the latest in orthodontic treatment and customer service for an experience unlike any other office you can imagine.

Jenifer

Clinical Director​

Jenifer

Clinical Coordinator

Jenifer has enjoyed 30 years in the dental industry making beautiful smiles. With her husband, two children and Chico the Pomeranian, she is quite busy in her spare time. Her daughter is a high school senior, who is a summer intern at OX, and her son is in college.

Jenifer said, “Being part of this high tech office keeps me on the cutting edge of orthodontics and therefore, I am always able to give our patients the latest and greatest of what our field has to offer.”

Johela

Orthodontic Technician

Johela

Orthodontic Technician

Johela is originally from Peru. She has been an Orthodontic technician for 7 years.

She says, “Working at OX has been a great experience for me. I am happy to be a part of the team participating in the transformation of a patient’s smile.”

In her spare time, Johela enjoys spending time with family and friends as well as watching movies, shopping and traveling.

Mary

Treatment Coordinator

Mary

Treatment Coordinator

Mary grew up in Forestville, Md and has lived in Jessup, Md for the last 25 years. She’s been in the ortho field for 19 years. She loves the laughter and fun we have with patients and in between patients.

Mary also loves to make candy in her spare time and finds it to be therapeutic. She has 7 grandkids and loves to enjoy time with them.

Erin

Administrative Director

Erin

Administrative Director

I have been with OX Orthdontix since 2011. I enjoy learning about orthodontics and the new technology the office embraces, which is amazing. I look forward to seeing everyone with their beautiful smiles! I am originally from Carroll County and now reside in Howard County. In my free time I enjoy to travel, shop, and watch movies.

Anne

Orthodontic Technician

Anne

Orthodontic Technician

I am a recent graduate of UMBC, where I studied Biology. I decided to take some time off from school to start working.

I am so grateful for the opportunity to be working in an environment where I am constantly learning an abundance of information about the field of orthodontics. I love being challenged to always provide top notch care and the ability to work with the latest technology. I am honored to be a part of the OX team. It is a pleasure to work with both the staff and the patients.

Misty

Orthodontic Technician​

Misty

Orthodontic Technician

I’ve been a part of the OX team since 2010. I like learning about new advancements and technology as they occur in orthodontics. I am a southern girl at heart, but currently reside in Gaithersburg, MD with my husband and two-year-old daughter, Julianna. Together, we love to go to the park, shop (more like look!), and bake scrumptious desserts for everyone at OX.

Christa

Marketing Assistant 

Christa

Marketing Assistant 

Christa is originally from Northumberland, PA, but now lives in Baltimore. 

Christa said, “I love working at OX because of the enthusiastic, high-energy environment, as well as my team’s obvious passion for our work and care for our patients.” 

Christa has a B.S. in International Business and French, and is also a classically trained opera singer.

Shannon

Orthodontic Technician

SHannon

Orthodontic Technician

Shannon has been an ortho tech for almost four years. She was born and raised in Maryland and of course, loves seafood. She has five beautiful children. Shannon said, ” I love what I do at OX because I love people and I love seeing patient’s smiles be transformed and the joy it brings them.”

Maritza

Orthodontic Technician

Maritza

Orthodontic Technician

Maritza was born in Washington D.C and grew up in Maryland. Her parents are from El Salvador.

She said, “I am so happy to be a part of OX for many reasons. Most importantly, because of the positive energy the office has and making patients love their smile.”

In her spare time, Maritza enjoys the outdoors and working out. One of her favorite memories was competing in the WBFF in Miami :).

Candace

Treatment Coordinator

Candace

Treatment Coordinator

Candace has over 13 years of experience in the dental field starting as an assistant and working in all other aspects of the dental field as well. The knowledge she has gained through the years and the experience she has, makes it possible for her as a treatment coordinator to help patients gain more confidence that they will achieve the beautiful smile they envision. 

When she is not at work you may find her at one of her son’s sporting events, boating, camping or even riding on the back of her husband’s motorcycle! She also enjoys traveling with friends and family. 

“I am excited to be part of a team that embraces new technology and empowers me to create a personalized plan tailored to the patient’s preferences and pocketbook,” Candace said.

Casey

Reception Assistant

Casey

Reception Assistant

Casey was born and raised in Catonsville, MD. She has been in orthodontics for 8 years. Casey said, ” I love it because I get to enjoy patient’s new smile journey with them!” When she’s not at work, you can find her cuddling with her cats or binging Netflix!

Ashley

Clinical Intern

Ashley

Clinical Intern

Ashley is a Howard County native, and grew up in Ellicott City.

She likes working at OX because of the staff and patients. 

Ashley said, “I am always excited to see the patients and help them along in their smile journeys, and I am so honored to work with the team and latest technology while constantly being able to learn about orthodontics!” 

 Ashley is an undergraduate student at University of Maryland with a passion for dentistry, and in her free time she enjoys playing the flute, watching old TV shows, and spending time with family and friends.

Marielle

Orthodontic Technician

Marielle

Orthodontic Technician

Marielle went to school in North Carolina and finished through an accredited dental assisting program in 2015.
She says, “I knew orthodontics was the ONLY specialty I wanted to work in and landed my first full time orthodontic job in 2016. “
I moved to Maryland from Texas in December 2019.
She is married and has one dog child and is expecting her first daughter.

She also says, “I love building relationships with my patients! Making sure they have the tools and knowledge to have successful orthodontic treatment is the most important part and what makes me love what I do.
I’m so lucky to have found OX Orthodontix.”

Malinda

Orthodontic Technician

Malinda

Clinical Technician

Malinda grew up in Centreville MD, a very small town on the Eastern Shore.
She said, “I like working at OX because I enjoy meeting new people, and love helping others achieve their beautiful smile.”
A little-known fact about Malinda; she traveled to Italy to play softball and represent the USA.

Testimonials

Becca

It's never too late to have orthodontic treatment. I thought it was passed that stage, I never had braces as a kid or teen. As I turned 30, I was excited I could straighten out my teeth.

Bella

My favorite thing about OX is how they treat you and how nice they are here. I love the staff members.

Lauren

I'd say that it's the perfect place, you feel like you are apart of the OX family.

Camille & Deandra

It's very easy, we change them out a couple of times a week.
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