how do i know when to change my toothbrush?
how do i know when to change my toothbrush?
user
Have you been cleaning your teeth?   Does it feel like a different brush each time you use it?
assistant
yes i have. no it does not feel different.
user
Can I check what you’re using?  I’ll just ask you to open the app.  I’ll see a picture of your teethbrush and some information.
assistant
no i just want to know how often to change my toothbrush.
user