Our Doctors

Come meet Drs. Guittard & Sierra, both members of the American and California Dental Association. Please call the office if you would like to come in. It could be the start of a successful relationship!

Lawrence Guittard


Dr. Guittard is originally from the San Francisco Bay area, but he has a long history in San Luis Obispo County. He graduated from Cal Poly in 1978 and received his dental training at the University of California in San Francisco.

He opened his practice in Atascadero in 1988 and has been grateful to be able to live and practice in such a beautiful community.

Christian Sierra

Cristian A. Sierra


Dr. Sierra was born in San Francisco, raised in Los Angeles, and met his wife, a Central Coast native, during his undergraduate education at UCSB. Dr. Sierra received his dental training at Western University of Health Sciences in Pomona, CA, did his residency at the Veteran’s Administration in Memphis, TN, and worked in private practice in Nashville before moving back to the Central Coast. Dr. Sierra was welcomed to the practice in February of 2018.

Dr. Sierra is a member of Spear Education’s Faculty Club. He meets with other General Dentists and specialists on a monthly basis to keep abreast of changes and recommendations in Dental Medicine.