Consider the following examples of two different types of statistical investigations. Example 1 Radio rating services sometimes collect data on listenership by asking participants to record the date, time, and station each time they listen to the radio.
Popular types of invisible braces include ceramic brackets, inside braces and clear aligners. Ceramic braces are just like metal braces, except that they use tooth-colored brackets (and sometimes tooth-colored wires) rather than metal to straighten teeth.
Types of Braces. Invisalign | Rubber Bands. InvisalignÂ®. InvisalignÂ® is the clear way to straighten teeth without braces, using aligners. Aligners are removable and virtually invisible, which means you can straighten your teeth without anyone knowing; and you can still eat and drink what you want. Also, you can brush and floss normally to maintain healthy gums and teeth; and there are no wires, metal or brackets to cause mouth abrasions.