Wireless connectivity and an app could be leveraged to:

• help you track how frequently you and/or your children brush your teeth
• to get reminders only if you didn’t already brush your teeth
• in tandem with pressure sensors, to inform you if you’re brushing too hard

Of those features, only the second one would require the toothbrush to have wifi access - the others could use bluetooth. That same feature could also be developed without using wifi if it was integrated with a smart home system like Zigbee, but would then require a hub and existing infrastructure on the part of customers to function.