![dental retainers, tooth retainer, hawley orthodontics passive appliance invisalign removable braces](/images/atlas/orthodontics-removable-dental-passive--1110.jpg)
PASSIVE: Typically worn at night after fixed braces are removed. This will hold teeth in their current position. This may also be called a Hawley retainer or just a retainer.
ACTIVE: Worn 24 hours/7 days a week except when eating or at important events. This will physically move teeth into position in about 6 months. This is also known as a Removable Active Appliance. Invisalign is a removable active appliance.
![hawley tooth retainers, spring aligner, orthodontics active passive appliances removable braces](/images/atlas/braces-orthodontics-close-teeth-closing-1111.jpg)
PASSIVE: Typically worn at night after fixed braces are removed. This will hold teeth in their current position. This may also be called a Hawley retainer or just a retainer.
ACTIVE: Worn 24 hours/7 days a week except when eating or at important events. This will physically move teeth into position in about 6 months. This is also known as a Removable Active Appliance. Invisalign is a removable active appliance.
![retainers, spring aligner, orthodontics, active passive appliances removable braces rotation rotate](/images/atlas/retainers-spring-aligner-orthodontics-active-1297.jpg)