I feel making an interdental stop is much harder than making a dental stop.
I am not trained in this field, so I may be going off base here. But I think that purely dental sounds (as opposed to interdental) are by nature instantaneous and therefore not subject to the concept of stop. Interdental sounds, by contrast, are easily stopped, at least by native speakers.
Both θ and đ are always interdental among native speakers, and pronouncing them as dental consonants is one of the most common errors that non-native speakers make.
When a dental consonant such as /t/ or /d/ occurs before θ or đ, I think it is usually pronounced as a tiny stop. But some speakers of AmE, particularly in the mid-west, simply omit the dental sound so that width sounds pretty much like with.
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