I know you have already dealt with this issue but I have a strong opinion on children's teeth so bear with me.
Children need to go to a Pediatric Dentist. Not a Family dentist. Small children need to be spared the experience of the drilling, the smell of the decay, the pain of the shots, holding their mouthes open for hours, everything that is associated with dentistry.
A Pediatric Dentist will put the child to sleep and do the work quickly and painlessly. They will do the procedure in the hospital or out patient surgery center where anesthesia is used regularly. It will be a gas and the kids are at little risk of side effects.
We found ours through regular children's dentist office. They knew the benefits of using a Pediatric Dentist instead of a Children's Dentist. It is so different. I can't express to you what a difference it makes to the kids. K had fallen and broken a tooth and needed a cap. She ended up having cavities too.They were all fixed, using white material, and she was awake in less than 1 1/2 hours and we were back in the car.
My best friends child had a cavity in her front upper tooth that their family dentist found, she went with me to the Pediatric Dentist but they didn't take her insurance so she canceled the appointment. She took her daughter back to her family dentist and he filled the cavity, it fell out a few weeks later, he filled it again, it fell out about 2 months later, he finally decided to pull the tooth because he didn't know how to fill it where it would stay. She was 4 and just got her adult tooth in the empty place at 6 years old.She endured the shots, the drilling, the pain of it hurting, the ugly filling material, all because the family dentist had no idea how to treat a baby tooth.