Meet Our Dental Staff

Dentist in Plainfield, IL

All professionals at Pinnacle Dental Group maintain the highest levels of accreditation and pursue ongoing education to stay abreast of the latest trends in the medical field. Read on to learn more about our staff's experience and training.


Justina Mockunas, D.D.S.

Dr. Justina Mockunas graduated in Lithuania from Kaunas University of Medicine, College of Dentistry where she obtained her DDS Degree in 2008. In 2017 she got accepted into Advanced Standing Program at NYU Langone Health and obtained Certificate for her 2 year Advanced Education In General Dentistry residency in 2019. Soon after this Dr. Mockunas moved to Chicagoland area and received her accreditation by CODA and obtained an IL dental license.
During her years of practice Dr. Justina has learned that making others smile from inside out is what drives her into becoming a better dentist everyday. She feels rewarded with being able to improve a patient’s self esteem and confidence by creating a healthy beautiful smile. Dr.Justina’s knowledge, gentle chair side manner and positive personality decreases her patient's dental anxiety.  She enjoys educating her patients about oral health. Dr. Justina constantly is seeking excellence in dentistry by continuing education to better serve her patients.

Erin Kirby RDH -Dental Hygienist

Hello, my name is Erin and I am a full time registered Dental Hygienist here at Pinnacle Dental Group.  I am excited to be part of such a dedicated and compassionate office.  I have been in the dental field since 2001.  I graduated with honors from Kalamazoo Valley Community College in 2006 with an Associates of Science Degree in Dental Hygiene.  I am certified to administer local anesthetic and also have a current CPR certificate.  

One of things I love most about being a dental hygienist is the opportunity to meet new people and help them achieve their best smile through education on their oral health.

When I'm not spreading smiles through treatment or education I enjoy spending time with my husband Jim and children Noah and Jamie.  

I look forward to meeting you at Pinnacle Dental Group and sharing my passion for dental hygiene to help you achieve oral health in order to maintian overall health.


Kaleigh Smith -Dental Assistant

Kaleigh is a 2013 Graduate of the Dental Assisting Program at College of Dupage. She is a full-time, certified dental assistant currently in pursuit of an associates degree in health sciences. 

Kaleigh assists Dr. Justina during procedures and helps provide patients with a calming enviornment. She also has a current CPR certificate.

"The best thing about working a Pinnacle Dental would be how each of our team members make patients excited about their oral health! Working with people who share the same passion is truly a blessing."


Sarah VanHoegarden RDH -Dental Hygienist

Hi, I'm Sarah and I am a full time Registered Dental Hygienist here at Pinnacle Dental Group. I am grateful to be part of a wonderful and caring dental team. I have been a dental hygienist since I graduated from Prairie State College in 2012. I finished my Bachelor of Science degree in 2016, which allows me to teach clinical dental hygiene part time, as well.

My favorite thing about being a dental hygienist is educating patients on how to improve their oral health. Every mouth is different and requires different care.

In my spare time I enjoy spending time with my family; especially my husband, Jay, and our dog, Jasper.

I am eager to meet you, as well as help you achieve and maintain your best smile!




Kylie - Office Manager

Hi, I'm Kylie and I am the Office Manager at Pinnacle Dental Group. In 2014 I received my Associates Degree in Business Administration. 

As an Office Manager I am always eager to answer any questions that patients may have and make sure our office is running smoothly and effeciently. I enjoy meeting new patients and coordinating the daily office activities. One of my priorities is making sure all our patient's dental insurances are up to date and explained to the best of my abilitly. I want to make sure every patient has a positive experience.

Please stop by the front desk and say hello!