Teeth is a symbol of problem-solving skills. Food, in general, are puzzles that our life gives us, teeth are our skills and methods we use to mill bigger issues into smaller ones in order to make them digestible and digestion itself is a process of cognition.

Therefore, losing teeth in a dream means that subconsciously you may be afraid that you are losing your skills, they are declining for some reason, you are becoming less capable, and your consciousness represents this feeling in a dream in such a way.

It's not necessarily that happens in reality, but it should be how your subconsciousness perceives things. I'd advise thinking about don't you put too much into an idea of possession of certain skills in order to achieve some goals that are important for you, what you do if you lose them, etc.