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Welcome to Sienella Thomaszadeh, DDS
Proudly serving North SLO County for over 30 years

Dentist Atascadero CA


At Sienella Thomaszadeh, DDS, we believe that optimal dental health is an integral component of good overall physical and mental health. Through continuing education, advanced procedure training, state-of-the-art materials and techniques, technological advances and by teaming with a well established team of specialists in our community, we work to provide our patients a pathway to beautiful, durable and healthy smiles. We believe that by practicing preventive dentistry and providing patient education and encouragement, we can take a conservative approach to providing dental care.

Experienced & Caring Team
for high quality care


The team at Sienella Thomaszadeh, DDS, is composed of extensively trained, highly experienced, compassionate dental professionals. We feel a responsibility to help our patients understand their dental conditions and present what options are available to address dental concerns as they arise. Customized treatment options and alternatives that match our patient’s needs to their expectations are presented whenever possible. We take pride in creating and maintaining beautiful smiles.

Learn More About Our Team
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With a Spirit of Giving


While providing the highest quality of care to patients within our practice is our calling and our passion, we feel an obligation to serve persons beyond our community as well. To that end, Dr. Romanelli has helped organize and participate in local school dental screenings, community health fairs, CDA Cares events and Baja Mission programs going back 30 years. During that time many thousands of patients have benefitted from our volunteer efforts. Dr. Romanelli also serves on California Dental Association’s “Board of Managers” which is tasked with producing the California State Dental Conventions; considered amongst the highest rated dental meetings in the world.

Learn More About who we Work With
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  • I was astounded at the personal care each and every staff member at that office gave me. I felt special. The dentist is awesome. She answered all of my questions. She was gentle and kind. Her whole office staff was very professional and very patient with me as I had a lot of questions. I highly recommend this dentist.
    ~Michele W.
  • The best dental visit I ever had! The team welcomes you with a smile and treats you with respect. Dr. Sienella Thomaszadeh is very knowledgeable, professional and kind. Well explained dental treatment. I definitely recommend her dental office. I’m very satisfied with my visit!
    ~Arlene C.
  • Sienella and her professional staff care about my dental health in a personal way. I’ve had 2 crowns and cleanings and they do an amazing job. Sienella is very caring and provides the most outstanding service. Thank you so much!
    Eddy R.
I was astounded at the personal care each and every staff member at that office gave me. I felt special. The dentist is awesome. She answered all of my questions. She was gentle and kind. Her whole office staff was very professional and very patient with me as I had a lot of questions. I highly recommend this dentist.
~Michele W
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Sienella Thomaszadeh, DDS, 4555 El Camino Real, Atascadero, CA, 93422-2700 - Related Terms: dentist Atascadero CA• dentist Atascadero CA• (805) 461-1772• www.dentalatascadero.com• 11/11/2020