Thank you for this video! :) I have 2 questions: if two persons use this brush (of course with different heads), can we have two acounts in the app or if not, can one person use the app and the other not use it (the stats of this person will not affect the other person’s stats?)? And, what about the heads, once they notify that is time to change the brush head, does it block you to use it until you change it? Thanks!