Are dental discount (not quite the same as dental insurance) plans tax deductible as medical expenses?

. . . subject to the 7.5% of adjusted-gross-income gap, of course. In other words, if you don't spend more than 7.5% of your income on medical and dental expenses, then it's not judged to be an undue burden.
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Dear Casey: (Yes) You are correct, however remember the 7.5% limitation is Federal and some states allow 100% of medical so check your state regs. This advice was prepared based on our understanding of the tax law in effect at the time it was written as it applies to the facts that you provided. Click on my profile to read more. Errol Quinn Enrolled Agent Master Tax Advisor
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