Teeth whitening products are available in wide range of prices and it depends upon you what you choose.
There are lots of people who spend money as much as required so that they get desired results while others cannot do so because of their limitations regarding fund.
It is good to remain within your budget if the product is good enough and harmless.
However most of the cheap teeth whitening products in the market are simply there to misguide you and it is quite possible that they might harm your teeth and gums as well.
Although there are some products that are inexpensive and useful as well as effective also, you need to find out the details before using any product.
However the cheapest way to get white teeth is to brush your teeth with baking soda.
Instead of going for cheap products it is good to opt natural methods so that there is no side effects rather.
Before using any product, ready-made or natural, go through the details and find out the disadvantages of using it.
As far as natural products are concerned you can eat strawberries as they are also effective and whitens teeth.
Overuse of any product can result in cavities or other teeth problems.
Some of the cheap teeth whitening products are whitening toothpastes, strips, gels and so on and it is advisable to use them after assurance of quality and harmlessness.
If the stains are quite severe, these products may not have any effect on them and consulting a dentist will only help.