This tag implies that the bands and artists are Serbian or originated in Serbia. Music represented by this tag is often highly commercial. Other, possibly better, Serbian tags are, for example Novi Val or nova srpska scena.
For how long do I need to wear retainers? It takes time for the bone and all the tissues around your teeth to reorganise and therefore it is necessary to use retainers until your bite stabilises. In the first month after the braces are removed, the risk of relapse is very high.
The average treatment time for invisalign is 12 months. The aligners provide .25mm of movement to the teeth per aligner. The more crowded your teeth are the more time it will take. The best way to insure that you are going to minimize your time in aligners is to wear them for 22+ hours a day and change into your next aligner every two weeks.