Hi there,
Both our children are covered by Helsana. They were 4 & 9 when we took out the cover and they had the completa coverage (up from basic).
My daughter now 11 has just has braces fitted. It was all rather simple and we got a quote 15,000 over three years. Helsana will pay out 75% upto a maximum of 10,000 for three years. I hope this helps