Thoraco-Lumbo-Sacral Orthosis or TLSO or back brace. Christina needs to wear hers most of the day.

This clip states it well:
Scoliosis TLSO: A custom total contact plastic body jacket that holds the scoliotic spine (a spine with at least one lateral curve) in as straight a position as possible. If worn tight and at least 22 hours per day, the risk of curve(s) progression is greatly reduced

We started building up to all day. After a recent appointment to have it checked, the TLSO needed to be adjusted for our Princess Christina. There was enough of change to start over on building up to all day. Christina will need to wear the back brace all day including bedtime. I feel so bad for Christina.