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Meet The Doctors

Sandra Calleros, D.D.S. 

Dr. Calleros has been providing life enhancing dentistry for more than 30 years in the South Bay communities.   She received her Bachelor of Science in Biology from University of California, Riverside and her Doctor of Dental Surgery from University of California, Los Angeles.  Go Bruins!  Along with private practice, she has been an instructor at the UCLA Dental School’s Restorative Department. 

Continuing education is extremely important to Dr. Calleros, as she spends countless hours taking courses to ensure she stays at the forefront of dentistry. She has taken many courses in advanced esthetics, occlusion, and treatment planning at the world-renowned Spear Education in Scottsdale, Arizona.   Her latest study is in implant dentistry and she has recently attained a Fellowship in the International Dental Implant Association.   She is one of the first and only Laser Certified Dentists in the South Bay.  Her continuing education will not stop here, as she understands the importance of staying ahead with current dental research and technology. Her latest achievement is the addition of cone beam computerized technology (3-D radiology).  She uses this for diagnosis of oral pathology, endodontic root canal treatment, and digital implant planning. This seamlessly integrates with CEREC technology, one-visit crowns.  She has earned the distinction of becoming a mentor for advanced CEREC classes at Spear Education and is a proud mentor of

Dr. Calleros loves dentistry because she can combine science with art to create not only beautiful, but more importantly, healthy smiles.  From the start of her private practice she has always upheld the highest level of ethics and integrity. You can trust that Dr. Calleros will listen to each individual need and provide you with optimal care.  She has chosen a team that holds the same beliefs and value system to ensure the entire dental experience can be pleasant, knowledgeable, and treat you like family.

Giving back to the community is important to Dr. Calleros.  Each year she joins forces with agencies such as Habitat for Humanity and the 1736 Family Crisis Center to provide dental services to local families who are unable to afford treatment.  She and her team have volunteered at Maria Shriver's Modern House Call for Women in Long Beach, California where they provided uninsured women on-site dental treatment.  In the past, she has volunteered with the South Bay Health District, where she helped low income children and abused women receive much needed dental work.  Giving back does not stop at volunteering her time, she continuously donates to many different charities and participates in local fitness events that raise money for various charities. She and her team recently did over $15,000 of dental treatment on families from a local crisis center.  In September 2015 she not only completed the Avon39 Walk to End Breast Cancer in Santa Barbara, she also raised over $6000.00 towards breast cancer research and treatment.

Dr. Calleros understands firsthand the importance of raising a healthy family.  She is a proud mother of two.  Her daughter graduated from San Diego State University and is pursuing a career in the entertainment industry and her son is a firefighter in Scottsdale, Arizona.  An animal lover, she has a beautiful Thoroughbred horse named Face and just added a new dog to her family, named Brandy.

Away from the office, Dr. Calleros enjoys many outdoor activities with her husband, Trey.  She is quite the weekend warrior.  You will most likely find her riding her road bike along the coast and through the hills of Palos Verdes.  Every year she runs in the Manhattan Beach 10K.  In support of UCLA, she combined three of her favorite activities, swimming, biking, and running, to complete her first triathlon, the Iron Bruin.  She also takes great pleasure in riding her horse and motorcycle, playing tennis, golfing and hiking.  During the summer weekends she spends her time enjoying the South Bay beaches or boating in Arizona, and during the Winter weekends skiing down the slopes of Mammoth.



Kristen Geyer, D.D.S

Dr. Geyer is very excited about joining the Calleros Dental Team in serving the city of El Segundo and the South Bay communities. Born and raised in Bay City, Michigan, she received her Bachelor of Science Degree in Chemistry at Saginaw Valley State University in Saginaw, Michigan and her Doctor of Dental Surgery degree from the University of Detroit Mercy School of Dentistry.

From there she moved to California to complete an additional year of training through a General Practice Residency at Cedars Sinai Hospital, where she was the Chief Academic Resident. Through her residency she gained advanced training in anesthesiology and removable prosthodontics.  She has also taken advanced coursed to become an Invisalign Orthodontics provider.  Currently, she is mastering CEREC technology at the highly sought after Scottsdale Center for Dentistry.  

Being able to use her special gift of dentistry to serve others brings much joy to Dr. Geyer, as she actively seeks out different opportunities to do so.  Being a part of a dental mission trip to Honduras, where she was able to help change the lives of so many was a very rewarding experience and she looks forward to doing it again in the future.  She has also volunteered in multiple states for Give Kids a Smile Day, where thousands of underserved kids receive free oral health services. Recently, she participated in Career Day at El Segundo High School. Her giving goes beyond dentistry, mentoring a local Manhattan Beach girls youth soccer team.  She looks forward to getting even more involved with the local community and finding ways to serve those in need. 

Dr. Geyer loves to remain active and is so excited about the year-round nice weather that California has to offer! Enjoying nearly all sports, she especially loves soccer and played on the women’s varsity soccer team in college. Since being here in California she has found a new love, beach volleyball and has taken up yoga.  You may find her running on The Strand, training for her next race...LA Marathon is on her bucket list. She and her husband reside in Hermosa Beach where they enjoy riding their beach cruisers, trying new restaurants, and walking their dog, Shelby, along the beach.

Dr. Geyer is committed to educating you about your oral healthcare and making you feel welcome in our office.  She loves working with patients of all ages and can’t wait to serve you at Calleros Dental!







131 W. Grand Avenue    |   Suite B   |   El Segundo, CA 90245   |   Call 310-414-9564