The meaning of a toothbrush in a dream is highly varied depending on the circumstances in which it was seen as well as the actual appearance of it. In general however it is a symbol of development and progress.
If a new and clean toothbrush is seen in the dream it indicates that new and fresh ideas will be soon suggested to you at your workplace. It will be up to you to decide whether those ideas will be the way forward.
A dream in which you will see a red tooth brush is strongly connected with a brief sexual adventure that will happen quite soon.
If you see a toothbrush that is blue in color you should be careful of legal and law problems. Be careful of what you sign and what will mean for you in the future even if it seems to be quite positive for your current situation.
The meaning of dream in which you will buy a toothbrush is that you will need to up your knowledge on some topic quite soon. You might feel that you are falling behind someone with knowledge and you will be keen to correct this as soon as possible. You might even pay an instructor or a teacher for this.
Seeing a lot of toothbrushes in a dream signifies that a lot of changes are coming your way in your personal life. You might enter or get accepted into a quite peculiar group or a club and your habits will change significantly as a result of this. This is especially true if you have this dream in the early morning hours of the night. There is also an alternative meaning of this dream which is that a hard work is coming your way. You might find yourself very busy soon but the hard work will contribute for your professional development.