These retainers can be taken out. They are clear plastic shields that cover all of the teeth in the arch. Retainers are expensive and delicate. In order to look after your retainers you must ensure they are kept clean and safe.
When you are not wearing your retainers always keep them in your box provided to prevent any accidental damage.
Retainers should be cleaned at least once a day by brushing with a toothbrush and rinsing under cold water, do not use toothpaste as this is too abrasive. A retainer disinfectant is available from reception and should be used occasionally.