I'm not sure what dental plans you're concerned about. Most don't cover things like crowns and Hollywood veneers. Most cover regular checkups and fillings - maybe braces for kids if you pay extra. That's not a huge burden on the USA economy... not with 15 Trillion in debt - mostly spent on the military.
What, really? Jesus.
Because here in Germany I have basic dental in the public health insurance, which covers, basic needs. On top of that I have private insurance for 288 EUR a year (24 per month) which covers:
100% of anything left out by the public insurance for basic work on teeth (like anesthesia in cases the public would not cover).
85% of costs for crowns, gold fillings, implants, etc..
Professional cleaning twice a year (which is around 150 EUR, so if you do that anyway it's already more than half of the cost of private insurance)