1) mentioned that technetium can be transplanted in dreams, so if your technetium friend or cold technetium has seen you recently, it is not surprising that you see your technetium expression cold in your dreams.
2) Black, maybe because you are in a bad mood recently, or you have seen something similar, such as black ointment …
3) He is squeezing toothpaste for you, probably because you have a good relationship ... or because you are eager to be considerate.
4) If you remember this dream all the time after waking up, I suggest you have a general examination or try to see a psychologist. If you don't feel anything the next day, don't worry too much …