Table 1.

Sample engagement messages across 2 formative webinars.

Message type	Message	Follow-up if message clicked
Reciprocity	A gift awaits you! Redeem $0.5 from Oralytics towards your Prize Account!	N/Aa
Reciprocity-by-proxy	You make the world a better place: Redeem $0.5 from Oralytics for your <<charity>> Account!	N/A
Question and answer	Do you ever have mouth sores?	Educational statements in Oralytics: If response=yes: Mouth sores can be really unpleasant. Brush twice a day, floss once a day, and use mouth wash to reduce the bacteria that can cause sores. If response=no: Great! Did you know that mouth sores can be caused by trauma, bacteria, viruses, or even ingredients in your food or toothpaste (for example, Sodium Lauryl Sulfate)?
Feedback	Want to know how well you’ve been brushing lately? Tap to view	Graphical feedback in Oralytics

^aN/A: not applicable.