Our Doctors


About Us

The brief descriptions below are designed to familiarize you with our staff's training, professional credentials and work experience. Dr. Les Elfenbein, and Dr. Shalini Tewary work as a team and consult with one another to provide the utmost in endodontic excellence.

Dr. Elfenbein:

Dr. Elfenbein completed his endodontic specialty training at the University of Pennsylvania. Prior to that he completed a general practice residency at Yale New Haven Hospital. His dental degree is from Fairleigh Dickinson University School of Dental Medicine.

He was selected by his peers as "Top Dentists" in each annual issue of the New Jersey Monthly Magazine from 2002-2023. He was also selected as a "Top Dentist" in Montclair Magazine from 2014 through 2023. He has also been included in the Guide to America's Top Dentists and was named a "USA Top Dentist" and "NJ Top Dentist" in 2018-2023. He is a past president of the Passaic County Dental Society and its editor. In addition, he is a fellow of the International College of Dentists.

Dr. Elfenbein is currently the Director of Endodontics at St. Joseph's University Medical Center in Paterson, New Jersey. He lectures extensively on the subject of endodontics at local and national meetings providing continuing education courses to dentists and endodontists. He is a published author in the Journal of Endodontics and the journal of Dental Traumatology.

Dr. Shalini Tewary

Dr. Shalini Tewary is a Diplomate of the American Board of Endodontics; the highest honor bestowed upon an endodontist by the AAE for academic and clinical excellence. After completing dental school at Boston University she served as a resident in general dentistry at Boston University. Dr. Tewary received the excellence award, an honor bestowed upon the top resident in that post doctoral program. In addition, in 2000 she received an excellence award from the North East Society of Periodontists.

Prior to pursuing her passion for endodontics, she was a general dentist in Bergen County for seven years. She completed her graduate training in endodontics at the University of Medicine and Dentistry of New Jersey. Dr. Tewary did research in endodontics which was published in the Journal of Endodontics.

Dr. Tewary was selected by her peers as a "Top Dentists" in New Jersey Monthly Magazine in 2014 through 2021 and a "Top Dentist" in Montclair Magazine in 2019 through 2023.

Dr. Joseph Stern

Dr. Joseph Stern completed his post doctoral endodontic residency at Columbia University College of Dental Medicine. Prior to that he graduated from Columbia University College of Dental Medicine. He is a member of AAE and presented at the AAE Annual Session in San Francisco. Dr. Stern was awarded the AAE/DENTSPLY award for that presentation.

We are proud to announce that he was recently named the diretcor of endodontics at Touro College of Dental Medicine. He has had many speaking engagements; most recently at the Greater New York Dental Meeting in December of 2020 as well as the New Jersey Dental Association annual session in March of 2021. He was selected as a "Top Dentist" in New Jersey Monthly Magazine 2021 through 2023 and "Top Dentist" in Montclair Magazine in 2023.

Dr. Anthony Arena

Dr. Anthony Arena completed his post doctoral endodontic residency at the Rutgers School of Dental Medicine. During his residency, Dr. Arena also earned his Masters in Dental Science, defending his thesis centered around public health and endodontics. At Rutgers, Dr. Arena became known amongst his peers as a leader – his passion for teaching in the undergraduate clinic and mentorship in dental education are exceptional.

Dr. Arena is also a graduate of the Bergen County Academies and Ramapo College of New Jersey, where he graduated summa cum laude with a B.S. in Biology. Dr. Arena received his Doctorate of Dental Medicine from the Rutgers School of Dental Medicine. In 2018, he received the American Association of Endodontics Student Achievement Award for his interest and commitment to the specialty.

Dr. Arena is a caring, knowledgeable, and dedicated professional committed to the highest quality. He is a proud first-generation Italian-American and is involved in many cultural organizations in the area. In his spare time, Dr. Arena is an avid soccer enthusiast and enjoys making artisanal pizzas in his backyard with his family and friends.