The baking soda works on the enamel of the teeth to lift away the staining while the citric acid in the lemon juice provides a natural bleaching action. You can make a baking soda paste by adding some water to it, and use on your toothbrush, or you can blend the baking soda with your toothpaste. Step1 Mix baking soda and the juice from a fresh squeezed lime, you want to use enough lime juice to bring the baking soda to the consistency of a paste. You can use baking soda, instead of salt, to make it more effective. Different theories exist on the benefits of adding lemon juice or strawberries to baking soda for teeth whitening. All you have to do is take a little of baking soda and make a paste by mixing it with some water and a dash of salt.
Thanks for the supportive words. It’s fine to oil pull with amalgam fillings. It’s important to grasp that amalgam fillings off gas 24/7. They give off more mercury vapor when stimulated. Most common ‘stimulants’ are hot drinks, brushing, dental cleanings, and chewing. I really don’t think that oil pulling would increase the risk of mercury vapor. And even if it did, my guess is the oil would tie it up and you spit out the mercury with the oil.
It makes sense that apple cider vinegar (ACV), which effectively works as a natural antibiotic and teeth/gum cleanser, would also be able to remove stubborn stains on the teeth. ACV is especially helpful for removing stains due to common culprits like coffee and nicotine (smoking). Some report that after using ACV it looks like you just got your teeth professionally cleaned!
Limit your intake of fruits that contain citric acid, such as oranges, lemons, berries and tomatoes. Too much citric acid can cause enamel erosion.[27] However, don’t completely avoid these fruits unless you have a digestive condition or allergy. These fruits contain many nutrients that are essential for bodily functions and contribute to creating a strong immune system.
Now that you are armed with these facts, let’s take a look at the various whitening options available in the market today. Professional whitening procedures provide the most efficacious results, especially when followed up by an at-home regimen to stabilize the whitening (think, high frequency, low intensity). For those who don’t have the extra money to spend on professional treatments, let’s take a look at the four categories currently available in over-the-counter today and which one to use based on how much time you have to commit to a whitening regimen. 
Ask your dentist about teeth whitening options. Your dentist can help you find the right whitening product or procedure to help you get a brighter smile.[35] Whiteners may not correct all types of discoloration, especially if you have brown or gray hued teeth. If you have had bonding or tooth-colored fillings placed in your front teeth, the whitener will not affect the color of these materials, and they will stand out in your newly whitened smile. You may want to investigate other options, like porcelain veneers or dental bonding. Some other ways to get a whiter smile are:

Underneath the enamel is a pale brown substance called dentin, which can become more visible when enamel gets thinner — a very common occurrence for many adults. (2) Dental erosion (erosive tooth wear) results from chronic loss of dental hard tissue that is chemically etched away from the tooth surface by acid and/or chelation (without bacterial involvement). (3) What are some of the reasons enamel thins? Risk factors include aging, genetics and intake of foods that promote erosion and/or staining. Many of these same unhealthy habits also increase your risk for gum disease.
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