Technically...yes.
But it burns a lot!!! (especially freebase)
Plus it takes a lot of spice too, more than needed when eating it.
150-300mg at least.
An MAOI does help it along a lot too!!
That's a lot of spice in your mouth!!
Try dabbing a few small crystals on your finger & put that under your tongue for a little while.
That burns quite a bit by itself!
Now imagine a 200mg pile of that burning it's way through your "mouth skin"!!
If this was a viable method, you would see a lot more threads talking about experiences this way.
But you'd be hard pressed to find even one post talking about an enjoyable DMT-in-the-mouth experience.
If you don't dig vaporizing spice, or haven't been having any luck that way...try taking an MAOI, then 20-30 minutes later, mix 60-100mg of DMT-Fumarate in warm water & drink it back in 1 shot.
This will last 3-5 hours.
And it won't burn you mouth up.
WS