Under the health care law, dental insurance is treated differently for adults and children 18 and under.
Dental coverage for children is an essential health benefit. This means if you’re getting coverage for someone 18 or younger, dental coverage must be available as part of a health plan or as a stand-alone plan. While it must be available to you, you don’t have to buy it.
This is not the case for adults. Insurers don’t have to offer adult dental coverage.
Under the health care law, most people must have health coverage or pay a fee. But this isn’t true for dental coverage. You don’t need to have dental coverage, even for children, to avoid the penalty.
taken from Healthcare.gov