Does one need different toothbrushes for after milk and meat meals? Why / why not?
AskTheRabbi.org answered:
No, there is no need for two toothbrushes. The simplest thing to do if you are concerned that there might be actual pieces of food stuck in between the bristles of the toothbrush is to rinse it out after use and then it can be used the next time without any cause for concern.
