Rummikub is a tile-based game for two to four players, combines elements of the card game rummy and mahjong.
A retainer is a simple device that helps to correct your bite, as well as sometimes address other conditions. You may have seen people wearing a retainer before, but they are not all that noticeable. A retainer is a small device that is made out of clear plastic, rubber, or even metal. They are custom-made so that they only fit your teeth. They are part of a treatment plan that has likely been determined by an orthodontist.
Braces can be removable or fixed in the mouth. One common misunderstanding is that removable braces are sometimes called retainers, but strictly speaking retainers are only used to keep the teeth straight after the braces have finished their work. Retainers, as the term suggest, is for holding teeth in position after surgery or any method of realigning teeth.