There are many insurance companies that offer dental services to seniors. Many are part of the group of insurance companies that fall under Medicare part C. While every insurance company under Medicare Part C offers the same medical coverage as Medicare Part A and Part B, they sometimes offer additional services such as dental coverage. Even so, the types of dental coverages that they offer are not identical.
Aetna is based in Connecticut and was founded in 1853. They have over 30 million customers worldwide. They offer a number of different types of plans including DHMO plans where you pay a lower cost for your plan, but have to see a dentist in your network and need to get preauthorization if you need to be referred for specialty care. They also offer network option plans or PPO plans. These plans are more expensive and you have to pay 50% or more of the costs of your care. While you can see a dentist outside the network with these plans, they have many PPO dentist that you can use for a discounted rate. If you go out-of-network you will have to pay and get reimbursed later. You can also choose hybrid plans that offer some of the benefits of more than one plan.
A dental plan is not dental insurance, but is instead a way to get discounts on the care you need. Their dental plans offer savings of anywhere from 10% to 60% on dental procedures with no limits or wait times to get care. With dental plans, you also do not have to fill out time consuming paperwork - you can simply go to a dentist that you choose within their network and get the services you need.
Dental plans will usually cover a portion of your costs on different types of dental procedures. Some plans focus more on preventative and basic dental care, but offer less coverage on major dental procedures. It's important to understand what's best for your dental health. If you routinely need a root canal or get cavities, you'll want a plan that provides better coverage on those types of procedures. In contrast, if you have relatively healthy teeth then you might not need to pay for the extra coverage.

eHealth Insurance was started in 1997 and it was the first platform used to sell health insurance over the internet. eHealth has over 5 million customers in 50 states. The company doesn’t provide dental insurance themselves, but acts as an insurance broker or marketplace. They have partnerships with over 180 health providers and they sell over 10,000 different health insurance products online.
Often, there is no waiting period in a group plan, like one offered by an employer. Of course, if you were eligible for a company-based plan, you probably wouldn't be shopping around on your own. However, the same privilege might be had in a group plan offered through an organization such as AARP.  With their plans, there's no waiting period for preventative services, at least.   
People buying their own dental insurance (as opposed to those covered by an employer's plan) sometimes get a nasty surprise when they sign up: a waiting period. Unlike regular health insurance, in which coverage usually starts immediately or at the beginning of the next month, dental plans often come with a delay between enrollment and the actual onset of coverage for some or all services. It could be six months to a year or more.
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