1. Delta Dental

Delta Dental is the largest dental insurance provider in the U.S., with a vast network of over 150,000 providers serving more than 80 million customers. They offer HMO and PPO plans, as well as managed fee-for-service and discount options. However, Delta Dental's maximum benefits are relatively low, capped at $1,000. Additionally, coverage and cost-sharing for orthodontic care are limited.