This depends on your own needs. If your current insurance covers all that you need, then there's no need to worry. However, if you or your children need to undergo an expensive procedure or long-term treatment, then you'll be able to save money if you take out dental insurance.
If you want to begin a long-term treatment, your dental coverage could help you save up to 20% of the cost. However, dental insurance could help you save up to 50%.
You'd get 14 free procedures with your current dental coverage as part of your health insurance. Whereas, with dental insurance, you would have 40 free treatments.