Meet Our Doctors

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Ronald C. Taylor DDS, MSD

Dr. Ronald Taylor received his bachelor’s degree in 1991 from the State University of New York at Stony Brook.  He enrolled in dental school at the University of Maryland in 1992 and in 1995 he did an externship at the University of Dundee Dental School in Dundee, Scotland.  In 1996, he completed his dental training and received his Doctor of Dental Surgery (DDS) degree from the University of Maryland.  Dr. Taylor returned to New York and completed advanced training in a General Practice Residency (GPR) program at The Bronx-Lebanon Hospital Center in 1997.  In 1999, he completed his endodontic specialty training and successfully defended his thesis, receiving his certification in endodontics and his Master of Science in Dentistry (MSD) degree from Case Western Reserve University in Cleveland, Ohio.

Dr. Taylor practices in Bowie, Laurel and Silver Spring, Maryland. In addition, he currently serves as an associate professor at Howard University College of Dentistry and as an appointed member of the Dean’s Faculty as clinical assistant professor at the University of Maryland, Baltimore College of Dental Surgery.  He has been a mock board examiner for endodontic residents in the United States Navy Post Graduate Endodontic Residency Program, the Medical College of Virginia, Boston University and the University of Maryland.   He has been appointed by the American Board of Endodontics College of Diplomates to serve as a mentor to board eligible endodontists.  He conducts several lectures and seminars on modern endodontics throughout the nation.  He is a diplomate of the American Board of Endodontics and a member of the American Association of Endodontists, the American Dental Association, and the National Dental Association.  Dr. Taylor is an alumnus of the Pankey Institute in Key Biscayne, Florida and he continues his study at the Walter Reed National Military Medical Center in Bethesda with the Edward C. Penick Endodontic Study Club.  He is the past president of the Penick Endodontic Study Club.

Dr. Taylor is proud to be a specialist member of the American Association of Endodontists. He was also selected to Washingtonian Magazine's List of Top Dentists for 2009.  Dr. Taylor is married to his lovely wife Chalissa and has two beautiful children, Kayla and Evan.  He enjoys traveling, deep sea fishing and music.



Adam W. Orgel DDS, MS

Dr. Adam Orgel is a native Washingtonian having attended Richard Montgomery High School in Rockville, MD. He received his bachelor’s degree in 2005 from the University of Maryland and continued on to obtain a Doctor of Dental Surgery (DDS) in 2009. He remained at the University of Maryland receiving a Masters in Oral Biology in 2012 while completing his endodontic residency. Dr. Orgel was presented with the Tony M. Ponti Memorial Award, which is presented to one graduating senior for excellence in clinical endodontics.

Dr. Orgel has been heavily involved with dental research. He worked as an intern at the National Institute of Dental and Craniofacial Research (NIDCR) at the National Institute of Health (NIH) and has had multiple publications. He also placed second at the 2012 American Association of Endodontics Annual Conference for his oral presentation on the relationship between oral bacteria and endodontic treatment.

Dr. Orgel practices in Bowie, Laurel and Silver Spring, Maryland. He is a specialist member of the American Association of Endodontists. In addition, he is a member of the American Dental Association, Maryland Dental Association, and Southern Maryland Dental Association. Dr. Orgel continues his learning at the Walter Reed National Military Medical Center in Bethesda with the Edward C. Penick Endodontic Study Club. He is also a founding member of the Premier Study Club in Bethesda.

 Dr. Orgel is married to his wonderful wife, Rachel.  He enjoys traveling and playing tennis in his free time.



Badri Jureidini DDS, MS

Dr. Badri Jureidini attended the University of Wisconsin Madison for his undergraduate degree. He graduated with a Bachelor of Science degree in Zoology with High Honors in 1994. He attended the University of Minnesota School of Dentistry, and earned his Doctor of Dental Surgery degree with High Distinction in 1998. After 5 years of private practice in general dentistry in Minneapolis, Minnesota, he was accepted into the endodontic specialty program at the University of Minnesota from which he earned his Master of Science degree and Certificate in Endodontics in 2005.

Dr. Jureidini joined a large, private, group endodontic specialty practice in Minneapolis, and had the opportunity to treat a large number of patients of all ages with complex surgical and non-surgical endodontic needs. He concentrated on treating patients efficiently with compassion, care, and devotion to their individual needs. Focusing on treating patients like they are members of his own family continues to be his goal today. Dr. Jureidini also had the opportunity to treat underprivileged patients in underserved areas while living and practicing in Minnesota.

Dr. Jureidini joined RCT Endodontics in May 2016 and works at the Laurel office. He is dedicated to providing quality, pain-free endodontic care to his patients, and to customize each procedure to accommodate each patient’s comfort regardless of age, case complexity, medical history or anxiety level. He takes pride in patiently listening to each patient’s complaint, and addressing it to the best of his ability.


 Juheon Seung DDS, MS 

Dr. Seung is an Endodontic Surgery Specialist. He earned his DDS from the University of Maryland, Baltimore School of Dentistry in 2013 and later returned to University of Maryland for a Master’s Degree in Science and Specialty Certificate in Endodontics. During his specialty training, Dr. Seung was the chief resident in addition to being a representative to the Advanced Dental Education Director’s Meetings.  He’s also a recipient of a research grant from the American Association of Endodontist (AAE) Foundation for his research on Endodontic Material.  Dr. Seung successfully completed a one-year residency at the Veteran’s Affairs Medical Center (VAMC) in Washington D.C prior to his specialty training.

Currently, Dr. Seung serves as a representative for new Endodontic practitioners at the AAE. He is a member of the American Dental Association (ADA), American Association of Endodontists and locally, the Maryland State Dental Association, Maryland Korean Dental Association, Edward C. Penick Endodontic Study Club. He is also affiliated with the University of Maryland Medical Center located in Baltimore, Maryland.

Dr. Seung currently lives in Baltimore with his wife and is an avid Terrapin basketball and Baltimore Orioles fan.



Chayne Coston, DDS

Dr. Coston completed his Bachelors of Science degree at Howard University, as well as graduated with a doctor of dental surgery at the top of his class from Howard University’s College of Dentistry.  He further completed hospital-based training through a residency program at the Bronx-Lebanon Hospital Center in New York.   This is where he chose to specialize in endodontics and completed a two-year residency program at the world-renowned New York University (NYU) College of Dentistry. 

 Dr. Coston brings his passion for dental surgery and root canals to our practices and our patients notice it right away!

Dr. Coston has volunteered his dental services through NYU’s global dental outreach with Henry Schein Cares. In addition, he has volunteered with the Boys & Girls Club of America, Congressional Black Caucus, Latino health fair, NDA Annual Day on Capitol Hill, Student National Dental Association oral cancer walk, Deamonte Driver Dental Project, Give Kids A Smile, Delta Phi Sigma clothing drive, Thanksgiving food drive, Special Olympics Haiti Relief Food Drive.

Dr. Coston is fluent in Spanish.  He is an active member of the American Association of Endodontists (AAE), the American Dental Association (ADA) and the District of Columbia Dental Society (DCDS). 

In his free time, Dr. Coston enjoys staying active, playing sports, reading, relaxing with friends and enjoying live comedy and music.



 Mahshid Majlessi Koopaeei, DMD, MSc


Dr. Mahshid Majlessi received her Master of Science (MSc) degree and a certificate of specialty in Endodontics from the University of Michigan . Prior to pursuing her Masters degree Dr. Majlessi attended the University of Pennsylvania where she received her doctoral of dental medicine (DMD) and was a Clinical Honors Program student and recipient of the “Pre-Doctoral Endodontic Program Outstanding Clinical Award”. She has published her research in the Journal of American Dental Association (JADA) in 2016 and currently maintains memberships in the American Association of Endodontics (AAE). She is a Diplomate of American Board of Endodontics .


At an early age Dr. Majlessi began to pursue her passion for dentistry.  She believes in providing care in a sensitive manner and is very skilled, offering a very calming approach to treatment which is appreciated by her many patients.  She recently joins our practice after working for a large endodontic practice in Ohio.

Since her relocation to the area, she enjoys spending time with her friends and family. In her spare time she likes to paint with watercolors and participate in sports and fitness events.  She is bilingual, speaking both English and Farsi.


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Office Locations

  • Silver Spring
  • 804 Pershing Drive
  • Suite 102
  • Silver Spring, MD
  • 20910
  • Map & Directions
  • Call: (301) 562-9455
  • Bowie
  • 3060 Mitchellville Road
  • Suite 108
  • Bowie, MD
  • 20716
  • Map & Directions
  • Call: (301) 218-7711
  • Laurel
  • 9889 Brewers Court
  • Laurel, MD
  • 20723
  • Map & Directions
  • Call: (240) 360-2412
  • Washington
  • 300 M Street SE
  • Suite 410
  • Washington, DC
  • 20003
  • Map & Directions
  • Call: (202) 701-1916