This is the best-documented dream image to survive from antiquity, and the ancient reading is nothing like the modern one.
Artemidorus devotes an extended section of his first book to teeth, and the system is a mapping. The mouth stands for the household, and the teeth for the people in it. The upper teeth are the more important or more prominent members, the lower the lesser; the right side and the left divide the household again, generally between men and women. Incisors represent the young, canines those of middle years, molars the old. He is explicit about the correspondence and works it in detail.
The consequences follow mechanically. To lose a tooth is to lose the person it stands for, whether by death, departure or estrangement. Which tooth is lost identifies whom. Teeth falling out in numbers indicate the breaking up of a household. He adds secondary readings in which teeth signify property and possessions, so that their loss can mean financial ruin, and he distinguishes cases, a tooth that falls out and is kept differs from one that is lost, a rotten tooth removed can be favourable.
None of this concerns anxiety, appearance, or the dreamer's inner state. It is predictive and it is about other people. Artemidorus is compiling outcomes, and he says so: he claims to rely on collected instances of dreams and what followed them rather than on any theory of what teeth mean.
The system is only intelligible in a world where a household was a defined economic unit whose composition mattered enormously, and where a dream was expected to be about events rather than feelings.