Phonetics vs. Phonology â¢Phonetics: the study of speech sounds â¢Phonology: the study of the sound systems of languages (sound system = inventory of sounds + rules). Phonetics vs. Phonology â¢Phonetics says: ^The /k/ in call h[k h Él] and in key [k i] are phonetically distinct.
The second type of retainer is a removable retainer. There are two types to choose from â a clear retainer and a Hawley retainer. Clear retainers are made from a thin clear plastic material that contributes to both their aesthetic appearance, and the minimal time needed to become adjusted while wearing them.
If you visit an orthodontist to have your retainer made the cost will be high, but there are alternatives to paying this price. Retainers are used to hold the teeth in place after having orthodontic work done. Sometimes retainers are used to hold the teeth in place between different stages of orthodontic work.