An essential part of dentistry is documentation and records.
This is for many reasons.
First, the pictures are taken and recorded in the patients file to begin their treatment.
Orthodontists use these specific pictures for diagnosis of the clients needs.
Second, these are taken for liability and proof for the client. Unfortunately in some cases, the doctor and patient disagree about specific areas of treatment and recording the appointments will help solve any issues.
Third, especially in orthodontics or when people are receiving a dental implant, the pictures serve as a before and after. It feels great to see how far you have come.
Radiographs or xrays are part of records well and are super important. Don't skip them.