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Meet the doctors on your iSmiles team.

When you select iSmiles Orthodontics in your quest for the perfect smile, you have made one of the best decisions of your life.

The iSmiles team continues its dedication to being a step above, so our patients know they are being treated by doctors who are passionate about their work and will always remain a cut above in terms of the newest treatments and technologies.

Our doctors also understand and are humbled by the unique impact they have on their patients’ lives. As their teeth become perfectly aligned, exactly as planned, iSmiles patients look better, feel better and have more confidence.

For iSmiles, nothing makes us happier than broad, beaming, beautiful smiles!

Meet Dr. O

Dr. O El-Hillal brings a wealth of experience to iSmiles Orthodontics. He is a founding partner of E&S Orthodontics, a successful, full-service orthodontic practice that has been serving patients in Phoenix/Peoria, Tolleson and Chandler, AZ since 2004. His love of travel and the outdoors brought him to California, and developing new ties as an owner of iSmiles Orthodontics. He simply loves the Irvine area and all that it has to offer.

What sets Dr. O apart from the crowd is his insistence on always reaching for the next level of perfection. He has been published in numerous professional journals and has held several leadership roles, including Chief Resident, while receiving his training. From day one he also developed a clear vision of creating an orthodontics practice that would be different, based on the latest research and technologies and a “face-driven, no-extraction” treatment philosophy.

After earning his Bachelor’s Degree from Franklin & Marshall College in Lancaster, PA, he moved on to the prestigious Maurice H. Kornberg School of Dentistry at Temple University – a center of excellence in dental education, patient care, research and community-based services in Philadelphia. There he earned his Doctor of Dental Medicine degree, MBA, Master in Oral Biology, and Orthodontic Specialty degree.

He remains a man in constant motion, using his energy to deliver orthodontic services that are far and above what you will find elsewhere. He’s adamant about staying up-to-date in terms of research and treatment technologies, to become a leading provider of the innovative “Damon” self-ligating bracket system, and a Premier Provider of Invisalign® and InvisalignTeen®.

Plus he’s all about educating the public about the benefits of orthodontic treatment. His informative Friday Focus YouTube videos, covering the gamut in orthodontic questions and services, are also featured on the iSmiles website.

When he’s not busy creating beautiful smiles, Dr. O enjoys spending time with his loving family, running, biking, golfing, hiking and scuba diving.

Meet Dr. Siddiqi

Dr. Ammar Siddiqi is thrilled to return to the Irvine area as a member of the iSmiles team. Born and raised in Southern California, he graduated cum laude with anthropology honors from the University of California, Irvine – right here in the heart of Orange County. He then earned his Doctorate of Dental Surgery at the University of Southern California’s Herman Ostrow School of Dentistry in Los Angeles, and Orthodontic Specialty degree and MBA at Roseman University of Health Sciences in Henderson, NV, where he served as a resident orthodontist at the Roseman Orthodontic Clinic.

Like Dr. O he firmly believes every patient deserves the highest standard of orthodontic care and that community involvement can build compassion and trust. As a student and resident, Dr. Siddiqi has volunteered at Give Kids A Smile, the USC Dental Humanitarian Club and USC Mobile Clinic. He also earned a Deans Award for Excellence in Research. He has been practicing orthodontics since 2014.

Dr. Siddiqi is an avid sports fan, enjoys traveling (especially to beach destinations like Hawaii and the Maldives), spending time with family and friends, and trying out different restaurants. His interests include hiking, jet skiing, playing basketball and attending Lakers games. He also admits a fascination for Shark Tank and watching Lakers basketball on TV.

Professional Associations

iSmiles Orthodontics is an active member of the American Dental Association, American Association of Orthodontists, Arizona Dental Association, California Dental Association and the Pacific Coast Society of Orthodontists. Plus Dr. O has also earned Invisalign® Preferred Provider status.

Become a part of the iSmiles Family!

All children, teens, adults and seniors deserve the benefits that go with a big, beautiful smile.

iSmiles Orthodontics, your Irvine Orthodontist, has the team you need to understand your unique problems and concerns, plus the specialized knowledge, experience and skills you require for a successful outcome. We promise as an iSmiles patient you will benefit from the newest orthodontic technologies and treatment techniques, so you will fully understand from start to finish each step in the treatment process. You will also enjoy an office environment that is clean, comfortable, efficient and friendly, staffed by people you will come to know as family.