Hi, I just got braces, but they added a little blue ball?

Hi, I just got braces 2 days ago but only on my lower teeth, although they added a little blue ball on my molar tooth. Does anyone know what its call

Hi, I just got braces 2 days ago but only on my lower teeth, although they added a little blue ball on my molar tooth. Does anyone know what it's called or its purpose?

or:Hi, I just got braces 2 days ago but only on my lower teeth, although they added a little blue ball on my molar tooth. Does anyone know what it's called or its purpose?

Tags:blue,little,tooth,brace,