Well, the very first advice I would offer you is when you go to a dentist office to allay your Dentophobia, I would verify that you were, in fact, seeing an actual Dentist despite the practitioner’s claim that they were, in fact, a dentist.
And if you feel as scared as I did after learning the dentist in question wasn’t a dentist at all, then make sure you do all you can do so the faux dentist
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"Cults," Sects, and "New Religious Movements"