does using low dose DMT(No breakthrough) have any similarity to high doses of DMT?
if someone can't breakthrough with higher doses,how much can he perceive about truth by using low dose DMT?

Once you have broken through you’ll likely recognize aspects of the breakthrough behind closed eyelids on a low dose.. but if you haven’t been there probably not.. it is a completely different realm of experience.. the surrendering to the sheer force of being thrust into that realm is a level of experience unrecognizable in a low dose..

What do you mean by “perceive about truth”?

I agree with this. And each experience is different, even at low levels, so you may get more or less relative similarity between low dose sessions. But you won't be able to necessarily recognize the similarities without having engaged them in the depths.

I'm not too sure what you mean about "truth," but low dose journeys can be deeply reflective with the headspace they can provide and personal truths can certainly be learned/gleaned/uncovered.

Hope this helps.

One love

truth is that idea which DMT tells us about the existence

The breakthrough and the low dose show you different things.. if you want to get the percs of a breakthrough level experience then I would have a breakthrough dose in a respectful manner.. i.e careful attention to set and setting. If your not sure then don’t do it.. wait until it feels completely right.. it’s a big commitment in that it can really shake you to your core and challenge your previous preconceptions about reality… in my case and almost everyone I know, that ‘rewiring’ has resulted in mostly positive things moving forward.. but there really is no need to rush into it