I highly recommend Dr. Robert Drosman. His offices are located on the southwest corner of Ventura Blvd and White Oak.
http://los-angeles.doctoroogle.com/reviews/viewdentist.cf...
He does not advertise as a pediatric dentist, but his entire staff is very child friendly, and both of my two children have had very good experiences there. My youngest (Tristan, now five) has been a patient of Dr. Drosman's from his very first dental checkup around his first birthday. My older son (Ben, now 14) has been going to Dr. Drosman for about 10 years, and has never required any dental care beyond ordinary cleanings and ex-rays.
Our family pediatrician is Dr. Irwin Bruckner. He works with his wife Laura; their offices are on Balboa, just south of the 101 freeway. http://www.healthgrades.com/directory_search/physician/pr...
He has provided excellent childcare to both my sons as well as offering a very sensitive and personal relationship with my children and our family.
I can't say enough good things about these medical professionals. Good luck in your search.