This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to make a fake retainer out of wax
Learn about damage to teeth.
A dental retainer works by applying pressure to your teeth. If this pressure is applied wrong, the result might be wearing away the enamel of the tooth's surface-and this is the least of the problems.

Available options:
(1). Some dentists recommend that you remove the wax immediately. You may even want to try saying " oh no " or " it's finished " beforehand.
(2). Here's how : Fold a paper dollar bill in half. Use your index finger to put a small amount of wax on the edge of the bill.
(3). If the pressure forces your tooth too much in one direction, bone resorption can occur and cause the tooth (or teeth) to become loose. You can also impact the blood flow to the tooth, which causes the tooth to die.
(4). Take these tips into consideration before attempting to make a fake retainer. Look for a silicone dental wax.
The answer is:
(3).