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.
1 Retainer Brite â Retainer Brite can be used in the same way as denture cleaners, but differ in that itâs formulated with the proper PH that wonât harshly affect plastic.  Mouthwash â Some patients like to soak their trays in mouthwash to clean them.