These are stainless steel rings that are cemented to your teeth using dental bonding agents. These bands can provide an anchor for your braces and orthodontic appliances, but they’re not used for everyone.
These small elastic “donuts” or rings can be used to create space in between your teeth when needed, typically before bands are placed. They’re also referred to as separators.
These tiny rubber rings or bands are used to attach the archwire to the brackets. They’re less rigid than spacers and come in dozens of colors.