A series of trays, worn in order
Clear aligners are removable plastic trays made to fit your teeth. Each tray is shaped slightly differently from the one before it, so wearing them in order moves teeth in planned steps.
You wear each tray as directed and then change to the next in the sequence. Because the trays come out, the treatment depends on them actually being worn — which is why consistency is discussed early rather than treated as a detail.
What the first appointments are for
The first visit is an examination. The dentist looks at your teeth, bite, and gums, and discusses what you want to change. That visit is to understand whether aligners, braces, or another approach should even be on the table.
If aligners are the direction, records of your teeth are taken so a movement plan can be prepared. The plan comes out of those records, so it is not something that can be sketched in advance from a photograph.
Where braces still make sense
Aligners are one orthodontic method among several. Some alignment and bite problems are better treated with fixed braces, and a preference for removable trays is a starting point for the conversation rather than a diagnosis.
Gum health, existing restorations, and jaw relationships all influence which approach is recommended.
About appearance and timing
The trays are clear, which many people find less noticeable than metal braces. They are not promised to be invisible, and small tooth-coloured attachments are sometimes part of a plan.
Tray counts and finish dates belong to an individual plan. Where you see those numbers published as standard, they are describing someone else's treatment.
Whether aligners suit your teeth and bite is confirmed after an examination. Ask what the plan involves for you before committing to an approach.