About Our Team

Dr. Rally Varlakova

Dr. Varlakova has been a dentist in Sonoma Valley since 2011, and has chosen to put down roots here with her husband and partner, Dr. Lee Tetz.  Born in Bulgaria, she comes to Cotati having grown up in Toronto, Canada, and then pursued her BS degree in Nutritional Biology at Rutgers University in New Jersey.  She completed her dental school education at the School of Dentistry at Loma Linda University in Southern California.  

While a student, Dr. Varlakova was distinguished with Honors in Pediatric Dentistry, was elected to the Dean’s List, and received numerous awards including leadership recognition from the International College of Dentists, as well as clinical awards from the American Association of Pediatric Dentists, and the American Association of Periodontology, among others. She has also taken many continuing education courses in the study of cariology, functional esthetics, laser dentistry, and other specialized dental techniques.

Outside of her dental practice, she enjoys cooking, gardening, exploring foodie experiences, traveling, going to concerts and theatre, doing yoga, and spending time with family and friends.

Dr. Varlakova is so excited to be a part of the excellent Cotati Dental Wellness team, and looks forward to many wonderful, healthful years as your community dentist!

Dr. E. Lee Tetz

Dr. Tetz has was born and raised in Napa Valley, and has returned here with his wife, Dr. Varlakova.  He has been to many parts of the world, and thinks there's no place like the North Bay Area.   Following dental school at Loma Linda University in Southern California, he completed a General Practice Residency at the VA Hospital on Mare Island, where he had extensive training in complicated surgical procedures, endodontics, implants, etc.  He performs many procedures such as root canals, surgical extractions, and implants for our practice.  He is also our IT specialist.  He takes care of our computer upkeep, and he is our Mr. Fix-It!


While a student, Dr. Tetz was distinguished with Honors in Periodontology, was elected to the Dean’s List, and served as his class Vice President.  He has also taken numerous continuing education courses in the study of implantology, functional esthetics, laser dentistry, and other specialized dental techniques.

Outside of his dental practice, he enjoys travelling along the California coastline, building and rebuilding anything and everything, riding steam trains, watching gold mining and logging shows, and spending time with family and friends.

Dr. Sylvia DeAguiar

Dr. DeAguiar was born and raised in Sonoma County, and is so excited to have returned home following the completion of her time in dental school.  She has had many adventures, and thinks there's no place like home!  After graduating with honors in acquiring her BS Degree from UC Davis, she completed her dental education at UCSF.  She performs all aspects of general dentistry with a gentle and thorough demeanor. 

Dr. DeAguiar has participated in numerous local and international mission trips providing dental care and medical relief to underserved populations in Jamaica, Mexico, and several parts of the North Bay area.  As a student, she was involved in several outreach organizations, including serving as President of Children’s Health Hut, an organization dedicated to improving the health of Bay Area youth. She pursued
additional certifications in Invisalign® as well as a clerkship in endodontics. 

Outside of the practice of dentistry, she is also an adventure guide and kayaking instructor in Tomales Bay! 

In her off time, she can be found on a soccer field, on the water, enjoying yoga, tasting delicious bay area

eats, or spending time with family and friends.  

She looks forward to taking care of you as your community dentist and maybe running into familiar faces too!



Carrie is our front office manager, and has graced the team and the staff of the practice with her contagious smile since 2011.  She has more than 30 years of experience in the dental field, and enjoys developing long term relationships with our patients and their families.  Carrie is here to coordinate your treatment appointments and assist you with maximizing any insurance coverage you may have.  Her excellence in coordinating patient care contributes immensely to the family environment that patients make note of when they come in for their check-ups and treatment.  She is excited to continue to serve the community for years to come.

In her spare time, she loves to play with her dog, be active, shop, travel, spend time with her family and friends and cheer for the Giants!




Catherine is one of our phenomenal dental hygienists.  She was born and raised in San Francisco, and when she was a child, she visited Sonoma regularly.  She fell in love with the Vallley then, and made the move to Sonoma from the city about 20 years ago.  She graduated from The University of the Pacific's Dental Hygiene program in 2005 and been practicing dental hygiene in Sonoma County ever since.  She works hard to educate her patients and be meticulous in her work, and feels lucky to absolutely love her career!

Catherine and our doctors share a philosophy of prevention and the belief in the importance of patient education, which complements their work together very nicely.  

In her free time, Catherine enjoys the outdoors, home improvement projects with her husband, and learning Spanish.  She loves animals, horseback riding with her lovely horse Drew, Giants and Warriors games, and plays golf as often as she can.



Grace is one of our exceptional Registered Dental Hygienists.  She started out at our office as an intern in the dental assisting program we participate in, then rejoined our team first as a dental assistant, and more recently as a dental hygienist, and we love having her back in our work family!  She was born and raised in Petaluma and was inspired by her childhood dental hygienist to pursue her career early on. She graduated from Grande High School, and completed her Associates Degree in Dental Hygiene at Santa Rosa Junior College in 2018 and has been loving her work ever since!. 

As a Dental Hygienist, she enjoys working with each of her patients and helping them to have  healthy smiles. She gets a lot of satisfaction from sharing her knowledge and resources with patients to help them improve their oral health and making sure they have a positive and comfortable dental visit.

In her free time you’ll find Grace cooking or eating at all the wonderful local restaurants, playing trombone in community band, watching Giants games, and giving her cat lots of attention.



Margie is our lead registered dental assistant. She was born and raised in Nicaragua, where she attended dental school in Managua. She then immigrated to the United States and settled in Sonoma County, where she lives with her husband and 4 beautiful children. She has been a dental assistant since 2011 and loves what she does!

Margie is passionate about patient care and comfort, as well as learning new techniques and expanding her knowledge to better serve our patients.  She is always willing to lend a helping hand or a shoulder to cry on when needed.

In her free time, Margie enjoys spending time with her family, nurturing a healthy lifestyle, and exploring new restaurants in Sonoma County.

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