Routine dental care (such as routine dental checkups, fillings, crowns, etc.) is not covered by Medicare and therefore a Medigap plan doesn’t cover it. Some procedures may be covered under certain conditions (e.g. you had to go to the emergency room and it was medically necessary to repair something in your mouth immediately – you can check with Medicare if you’re not sure if a given procedure would be covered.
Medigap plans are standardized meaning the plan itself is exactly the same, regardless of the carrier you buy it from. Some carriers may offer value-added services with a Medigap plan such as discounts on some services (e.g. 10% of a service) with certain dentists, but not actual dental insurance.
If you want to have dental coverage, you would need to add them as a separate supplemental plan.
I hope the information is helpful – please feel free to contact me for help with your coverage and if you have any other questions. Thanks very much.