I have not seen a supplemental policy that would cover the difference. If you did happen to be lucky enough to find such a policy that would, make sure there is not a limitation for a "pre-existing condition" or a waiting period that would need to be satisfied before "major" treatment, like root canals & crowns, is allowed. Doesn't help with your original question, but may be of use if you do find your answer. Best of luck!
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