Get to know our friendly, knowledgeable and dedicated team.


Douglas Delli Colli, DMD

Dr. Douglas Delli Colli grew up in a small town named Pepperell, MA just south of Nashua, NH. 

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Demitroula Kouzounas, DMD

Dr. Kouzounas is a graduate of Thornton Academy, the University of Maine Orono and Tufts...

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Colette Sirois, DMD

Dr. Sirois was born and raised in Waterville, Maine. She pursued her undergraduate studies at Harvard... 

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Nichol Irene Penna, DMD

Dr. Nichol Penna is a graduate of Thornton Academy, Colby College and Tufts University School...

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Joseph G. Penna, DMD

Dr. Joseph G. Penna is a graduate of Portland High School, the University of Maine Orono, and Tufts...

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Registered Dental Hygienist

Darlene has been a hygienist at Dunstan Dental Center since 1989 and was a graduate of Westbrook College--now known as UNE. She is a past member of the Maine Dental Board of Examiners, which she enjoyed serving on for 5 years. Darlene is also a long time Scarborough resident and still lives here today with her husband, Ric, and chocolate lab, Styx. She has 2 grown daughters, Katrina, who lives in Austin TX, and Samantha who lives in Saco. In her spare time, Darlene loves raising chickens and enjoys volunteering at a local school.


Registered Dental Hygienist

Abbie was born and raised in Standish on the Sebago Lake Basin.   After graduating from UNE with a bachelors degree in dental hygiene, she was hired full time and has been with Dunstan Dental Center since 2013. Abbie now lives in Scarborough with her husband, Zak, two rescue dogs, Henry and Luna, and an extremely strange cat named Phil.


Registered Dental Hygienist

Shawna joined the Dunstan Dental team in 2008 upon graduating dental hygiene school at the University College of Bangor. Shawna resides in Scarborough with her husband, son, and dog. Shawna enjoys the beach and participating in triathlons. 


Front Desk Manager

Crysta graduated from Smith College in 2015 and joined our team in 2018.  She believes that everyone should be confident in their smile, as a smile is a result of joy and laughter.  She lived in Maine her whole life and could not imagine living anywhere else. She loves watching Superhero movies with her husband, Austin, therefore it is no surprise friends know them as Batman and Wonder Woman.  During her time off, Crysta enjoys trying new restaurants and taking road trips to new places.


Office Mascot

Chucky floats around, greeting patients young and old. He is always on time, polite and keeps his shell clean.


Lead Dental Assistant

Thea is Dr. Joseph Penna’s assistant as well as the Lead Assistant. She joined the Dunstan Dental Center team in 2009. Thea is the proud aunt to 3 nephews and 1 niece. In her spare time, Thea enjoys spending time with friends and family.


Patient Financial Manager /

Treatment Plan Coordinator

Erica graduated from the University of Maine at Orono with a B.A. in Psychology and Sociology.  She joined Dunstan Dental Center as part of the front desk team in 2013 and is currently our Patient Financial Manager.  She enjoys helping patients with their billing and scheduling needs to get them closer to their dental goals. When not at work, Erica enjoys hiking with her son and husband.


Front Desk

Bio coming soon


Registered Dental Hygienist /
Office Coordinator

Missy is a registered dental hygienist who has been part of the Dunstan Dental team since 1994. She graduated from Westbrook College (University of New England) in 1994. Missy has a strong passion for abused and neglected dogs. She will take them in as needed and provide them with loving and safe home until they are ready to be adopted. She currently resides in Dayton with her husband, three daughters, and her special fur babies. Her favorite quote: “Saving one dog will not change the world, but surely for that one dog, the world will change forever.”
–Karen Davison


Registered Dental Hygienist

Shannon graduated from University of New England school of Dental Hygiene in 2006. She has been part of the Dunstan Dental Center team since 2007. Shannon enjoys educating patient’s and helping them progress with their oral health. One of her favorite things about being a hygienist is the relationship she builds with her patient’s. Shannon & her husband live in Windham with their 8 year old daughter, Kameryn and pit bull, Eva.


Registered Dental Hygienist

Jessica is a registered dental hygienist who graduated from the University of New England in 2017. She joined the Dunstan Dental team in February 2019 making her one of the newest hygienist in the practice. She also works at a pediatric dental office which she really enjoys. Jessica and her fiance Daniel live in Buxton with their 2 cats Cali and Grayson and their puppy Parker. When she is not at work she enjoys spending time with friends, family, and staying active outside with Parker.


Dental Assistant

Haley joined the office with three years of experience in 2019. She graduated dental assisting school in 2016 at dental careers institute. Haley grew up in Baldwin, Maine and loves spending time with family and friends, outdoor activities, and watching football. 


Registered Dental Hygienist

Jennifer grew up in Enfield, a small town in Northern Maine.  She now resides in Waterboro with her husband, two children, and her boy (pet dog), Cash.  She graduated from the University of Maine in 1997 with an Associates Degree in Dental Hygiene. She went on to further her education at the University of Maine, Augusta, receiving her Bachelor of Applied Science Degree in 2016.  In her spare time, she enjoys spending time with family and friends, camping, motorcycling, and snowmobiling. 


Dental Assistant

Molly is from Cornish, ME. She joined the U.S Army in 2013 where she earned her dental assistant certification. Molly joined the team in 2019 with six years of experience. Molly enjoys spending time with her family, friends and her dog Apollo. 

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Dunstan Dental Center
618 U.S. Route 1, Suite 4
Scarborough, Maine 04074

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TEL: 207-883-3229
FAX: 207-883-1184


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Mon: 8am - 5pm
Tue: 8am - 5pm
Wed-Thu: 8am - 6pm
Fri: 8am - 3pm
Sat: 8am - 12pm