How to whiten my teeth in just 1-2months and the cheapest way? (Photo)

I just got too curious about teeth whitening when I applied for cabin crew position locally and internationally. Then I noticed I had these yellow teeth with pointy edges and I think these are my problems for landing my dream job. Can you give me an advice on how to whiten my teeth for 1-2 months in the most cheapest ways? I tried Dazzling white pen and I think it helped but it's just time consuming. (I'm still using it though)

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