Our Dentists

Shannon Arndt


Dr. Arndt graduated from the University of Kentucky College of Dentistry in 1999 and completed a residency in General Dentistry in 2000. She served in the US Navy as an officer and dentist for 6 years and worked at a group pediatric dental office in Corpus Christi, TX before relocating to Concord in 2007. While practicing in New Hampshire, she has worked in private practice in a pediatric dental office, group general dentist office, and most recently, in public health at Concord Hospital Family Health Center Dental Clinic. She has been a long-standing member of the American Dental Association,  Academy of General Dentistry  and the local component-Concord Dental Society. She is a course instructor at New Hampshire Technical Institute Dental Hygiene School and is active in the community by serving as a board member for a local non-profit organization, Womenade, assisting women and families in the area. She enjoys running, hiking, camping, bike rides, and many outdoor activities with her husband, Dan, and their two children, Rowan and Gracen.

Anthony Francis


Dr. Francis completed his undergraduate studies at the University of Massachusetts, Amherst before going on to complete his dental training at Boston University School of Dental Medicine. He is a member of the American Dental Association and the Concord Dental Society as well as a Premiere Provider with Delta Dental.

Raised in Salem NH, Dr. Francis enjoys skiing, soccer and traveling in his free time.

He is eager to build personal relationships and a comfortable environment for our patients and is looking forward to service our community.

Our Office Staff

Brenda H.

Practice Administrator

Brenda has 25+ years of Office Management and HR experience. After spending the last 8 years working in the outpatient medical field, she is excited to bring her skills and knowledge to the practice. Brenda loves riding ATVs, camping, and being in the woods and spends her free time enjoying her family, especially her 7 grandchildren, goats, ducks, chickens, and dogs!

Jennifer C

Front Desk Coordinator

Jennifer joined our team in July of 2017 and brings her 20+ years of dental experience in
general dentistry and oral surgery customer service. Jen is a native of the Lakes Region of
NH and is a proud parent of a son, Ethan, a recent college graduate and on his own. Jen
loves to explore our great state (mostly back roads!) and usually with the company of her
two dogs.

Katherine W

Front Desk Coordinator

Katherine graduated from the NHTI Dental Assisting Program in May 2018. She is a NH native who enjoys the outdoors, hiking, and spending time with her two young daughters, husband and Alaskan Malamute.

Shannon F

Patient Care Coordinator

Shannon has more than 3 years of dental office experience. She graduated from The University of New Hampshire with a degree in Nutrition and Wellness with minors in Psychology and Gerontology.

Shannon loves to develop meaningful relationships with her patients and peers.

In her free time, she enjoys boating, reading, trying new restaurants, and spending time with her boyfriend and her 2 cuddly cats.

Our Dental Assistants

Stacey M

Dental Assistant

Stacey graduated from The University of New Hampshire in 1992 with a Bachelor’s degree in Sociology. She has worked with Dr. Orzechowski since 1999. She enjoys boating, traveling and spending time with family and friends.

Angela T

Dental Assistant

Angela has worked with Dr. Orzechowski since 2004. She received her CDA from The New Hampshire Technical Institute. She enjoys being active and spending time with her family and friends.

Lindsay L

Dental/Sterilization Assistant

Lindsay is a recent dental assisting graduate. She is new to our team and working on expanding her knowledge in assisting as well as the dental field. She loves all aspects of dental assisting. In her free time, she loves to go to the gym, bake and hang out with her friends.

Our Dental Hygienists

Tammy D

Dental Hygienist

Tammy started working with Dr. Orzechowski in 2009. She graduated from NH Technical Institute in 2002 with her dental hygiene degree. Tammy is also certified in administering local anesthesia. She enjoys spending time with her family, friends and her two dogs. Her interests include exercising, gardening and cooking.

Patti J.

Dental Hygienist/Infection Control Coordinator

Patti joined our practice in April 2014. She graduated from Erie Community College in Buffalo NY in 1985 with her Dental Hygiene degree. Additional training has included her certifications in administering local anesthesia and nitrous oxide. She is a member of the N.H. Dental Hygiene Association. Outside of the office, Patti enjoys spending time with her family and being outdoors running, hiking and biking.

Leigh-Ann F

Dental Hygienist

Leigh-Ann joined our practice in 2015. She graduated from New Hampshire Technical Institute with a degree in Dental Hygiene in 2003. She is certified to administer local anesthesia and laser therapy. Leigh-Ann enjoys spending time with her husband Matt and four children. She also enjoys skiing, reading and outdoor activities.

Rachel R

Dental Hygienist

Rachel graduated from NHTI in 2019 with an Associate’s degree in Health Sciene and a Dental Hygiene degree. She joined our team shortly after graduating. She is certified in local anesthesia and nitrous oxide administration. Her interests include traveling, snowboarding and other adventurous activities.

Miranda F

Dental Hygienist

Miranda graduated with honors from NHTI in 2019 with her degree in Dental Hygiene. She has been with our team since August 2019 and was inspired to become a hygienist through the care and treatment she received as a child right here in our office! Miranda enjoys spending time with her daughter, family, and friends. She also enjoys gardening, disc golf, and skiing.

Siobhan S.

Dental Hygienist

Siobhan graduated from NHTI dental hygiene program in 2020 as a member of Phi Theta Kappa. She is also certified in laser and administration local anesthesia. Siobhan enjoys spending her free time with her husband Steve and two children going on hikes or being at the lake house.

Contact Us
280 Pleasant Street

Concord NH 03301

(603) 228-4456

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