I've never really achieved full lucidity in my dreams, even though I do remember all my dreams.

I registered here about a month ago, so yeah I'm kind of new!
I've tried to make new habits when I'm fully awake (like taking reality checks) to make the habits cross into my dreams.

Talking about those "dream-signs", I have one in particular which is also mentioned in the guides.
I seem to loose my teeths, and I always believe I'm awake while doing so.
Last night I even took a reality check while dreaming (after I lost a tooth) by breathing while holding my nose closed.
I also prepared to not consentre with the breathing while doing the check.
I couldn't breathe, just great, I bought the dream as a reality.
(In my own honest opinion, my dreams are VERY realistic)

So for me, the breathing reality check habit didn't work, or at least it isn't fully reliable(?).

I do admit that the only true reality check I can use, is reading stuff from papers/magazines.
When dreaming, the words always change for every glims I look.

However, I'm wondering if I'll just accept this reality check aswell when I use it in a dream.
Could it occur that I will read the words just once, and then when I look upon them the next time,
(even though the words has changed) that I will accept it because as long as the subconcious mind shares memory with my awareness.
I didn't actually remember the words from the first time I looked at it, and neither did the subconcious mind.
So could the subconcious mind fill in the gaps with some possible words?

Think of it like this:
-I'm in a dream. I see a red car.
-Now I spin around, and see the car again. This time the car is a bigger car than it was originally, and with different shapes.

Maybe because the first time I saw the car, the car was only a car as in the word "car" - and didn't have any shape at all.
My mind told me that it was a car, so I accepted that fact.

But it's always at the moment I wake up, that I realize that the car was really just a caravan from the start.
This realization never happens while I'm dreaming, hence it's really hard to use my memory while dreaming.
It also happens with dream-characters. Through an entire dream my dream-characters can change up to 3-4 times.
I didn't understand that they changed appearances while I was dreaming, but I do realize what has happened when I wake up.

My awareness always agree with the subconcious mind while dreaming.
But I do not have much of those unrealistic physics stuff (it has happened).
However, they do make a lot of nonsense. But I never realize that untill I wake up.