Definition of 'retainership' 1. the property of retaining or retainment. adjective. 2. (of contracts, services, etc) having the property of retaining or retainment.
Traditional (Hawley) retainers have a piece of wire attached to plastic (or acrylic). Clear retainers (Essix) are also plastic but don't have any wires. Both are custom-made to fit your teeth.
Agreement periods usually run up to five years, but initial retainer agreements are often reviewed and renewed annually—usually at the end of the financial year. Retainer hours are usually spent on recurring tasks that aren't major projects but are important to the client.