Please choose the correct ending to complete the given sentence: Health: [header] How to whiten your teeth without spending a lot of money [title] Try a tray or gel. [step] Trays and gels designed to whiten teeth can be purchased over the counter at most supermarkets or drug stores. Such methods are fairly effective , 80% of users reporting results.

Ending1: [substeps] Read the instructions on the gel and tray you purchase so you know exactly how the product should be used. Some trays should be worn for a few hours a day while others are worn every night. Ending2: The quality can be kept light and fluffy and you may notice your teeth looking pale and refreshed. [substeps] Make sure your trays and gels complement your mouth and gums. Ending3: [substeps] Tooth extraction, which is done by using a toothpick, is used in rare cases of tooth decay. It is a less potent procedure and should not cause significant pain. Ending4: Read reviews of the trays and gels before you begin whitening your teeth. Buying a tray or gel does not erase past stains and does not offer much in the way of an effective whitening method.

Answer format: ending1/ending2/ending3/ending4