I don't know the difference between the trays and the sticky things. I don't know. ha. I need it to last pretty long too.
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i'm currently using the crest white strips - classic. theres also other categories including premium or advanced seal or pro-effects. i guess the cheapest would be the classic. crest gives you 28 packs of strips for a 14 day use, 2x a day. so you could say it lasts pretty long. if you want a better effect, buy a whitening tooth paste along with the crest white strips, such as crest vivid white, or pearl drops :)
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