Are you out of hearts?

There are plenty of ways how to restore your Lives:

• The easiest way is just to wait a bit because Lives are going to refill themselves (30 min per 1 heart)
• If you don’t want to wait, you can spend coins to speed up the process. Of course, you might prefer to keep coins. 
• You can create or just join the existing team to get free lives from your friends.
• You can always watch an ad for an extra life as a quick life restore.

If you are already capped on Lives they will be stored in the “Lives” tab — available from the main menu bar.