/l/ as an interdental?

[Carolina1983]

[h=2]Hello, all! I´m posting here something I had "mis-posted". Thank you for your kind help, as always![/h] --
Hello again!
In "tell them", can /l/ become interdental? :?:

 

[Asdherel]

Hello!
In my opinion, I think the "th" sound (/ð/) would be dropped in connected speech rather that the /l/ become interdental. That's what I've learnt at university ("them" is pronounced in its weak form, so it would be pronounced as /əm/).

 

[Raymott]

Hello again!
In "tell them", can /l/ become interdental? :?:

Yes, it can. As you transition from /l/ to /th/, your tongue can slide interdentally. In fact, it seems that in connected speech, it has to be so, because if you're ready to pronounce /th/, that's where you tongue is and you're still saying /l/. (The /l/ doesn't start there, of course. I'm understanding your 'become' as meaning during its articulation.)
"Tell'em" is a sub-standard form that occurs in rapid or careless speech. Naturally, as with 'with', there are regional and individual variations, but you don't want to teach "tell'em" as being standard.