How do i get heart refill

Question

when my heart finishes what do i do? Do I take lessons that help me regain hearts?

Answer 1

You either need to wait for them to refill or use your earned bits to replenish them.

Answer 2

if you loses all your heart than use bits to refill them or wait 4-5 hourr

Answer 3

1: wait 4-5 hours
2: pay with bits