If you used a toothbrush in a dream, then it suggests you to be more indulgent with what other people saying to you. There is no need to take every opinion as very important to your being. On the other hand, you are the one who says more then he should, therefore you brush the teeth, because you are trying to wash away that guilt.
Toothbrush dream meaning
Read more about dreaming of Toothbrush in other dream meanings interpretations.