Unless your employer heavily subsidizes it, dental insurance is NOT insurance. It is basically a smoke and mirrors "budgeting tool". The typical maximum annual payout is $1,000 per year, plus there are deductibles. They will claim they are giving you all kinds of discounts, blah, blah, blah (mostly BS).
Generally speaking, the plans can be helpful for families. I have to tell you, as an individual with an unsubsidized plan, it's mostly smoke and mirrors. I dropped mine and put $50 per month in a virtual "dental account" (same thing or better).