Yes, you can use HSA funds to pay for premiums for dental insurance, IF you are sure that the premiums are not being deducted somewhere else (it doesn't sound like they are).
See "Medical expenses include the premiums you pay for insurance that covers the expenses of medical care" Since dental expenses are considered medical expenses (for the type of expense you are referring to), this is allowable.
The same with vision insurance premiums. Please see IRS Pub 502.
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