is there any way you can whiten your teeth at home?

i want to whiten my teeth and i'm broke so i can't buy a kit or anything. any suggestions would help.
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if you want to do an at home remedy for whitening teeth, peroxide would be okay once a week. not too much of it because it can cause the enamel to disintegrate within time. and when you go for checkups with the dentist, they will see the enamel of your teeth is weak and you can actually see through it. strawberries are also a good substitute to whiten teeth because its full of calcium, selenium, phosphorus, and magnesium that can help for stronger teeth and its natural color.
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