Final answer:
The orthodontist likely recommended that Raina wear a retainer or a similar orthodontic appliance at night, a common practice after braces removal to maintain teeth alignment.
Step-by-step explanation:
The question revolves around a specific detail from a narrative, likely from a novel or story where the character Raina is under orthodontic treatment. In the context of orthodontic care, it is common for an orthodontist to recommend various devices to aid in the correction of dental issues. While the question does not specify the text or background story, in many cases, orthodontists suggest patients wear retainers at night after the removal of braces to keep teeth in their new position.
For Raina, it is possible that the orthodontist advised her to wear a retainer or another orthodontic appliance such as a night guard or headgear. This kind of appliance helps to maintain the alignment of teeth, correct bite issues, or alleviate problems such as teeth grinding during sleep. Without the specific context, we can only infer that what the orthodontist recommended for Raina is a common practice in orthodontic aftercare.