You should update this article: https://en.m.wikipedia.org/wiki/TV_detector_van#Detection_techniques

Tooth filings pick up AM, not FM. Assuming that’s even a real thing. All you need get AM is a diode which can be made to varying levels of performance with a number of common materials.

FM radios generally use superheterodyne receivers which generate a radio frequency to be mixed with the incoming signal to pull out audio.

This receiver does emit a small amount of RF as a result and it’s how the TV police in the UK would catch you for skirting a TV license.

As John Mulaney explains, you use your favorite doctor finder website and sort by fewest stars.

PSA: Download all your kindle books. Even if you don’t plan on cracking their DRM, you’ll have the option to in the future should you want to.