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.
Retainers are needed to hold the teeth in place once the braces are removed, but unfortunately, retainers are easy to break and lose. Once a retainer has been lost or broken, it needs to be replaced to keep the teeth in place. If you visit an orthodontist to have your retainer made the cost will be high, but there are alternatives to paying this price. Hawley Retainers are known to last the longest and can be ordered by mail for a lot less | Source. Retainers are used to hold the teeth in place after having orthodontic work done.