However, lemon juice is acidic. If we were in your shoes, we would not use lemon juice for brushing our teeth, because the acidity may weaken your enamel and increase your chances of damaging it as you brush. We explain more on acidity in our articles “How to Drink Kombucha and NOT Destroy Your Teeth“, “Can Brushing After a Meal Damage My Teeth?“, and “Tracking Your Saliva pH“.

You can also try a few home remedies to whiten your teeth, though not all dentists recommend them. Brushing the teeth with baking soda can produce slightly lighter shades. You can also brush with no greater than 10% strength hydrogen peroxide. For drug store methods, gel kits are thought most effective, and brush on teeth whitener the least. However, with minimal tooth yellowing, over the counter remedies are less expensive than dental whitening, and may provide you with the lighter shade you desire.
H2O2 shouldn’t be used orally if you have amalgam fillings as it reacts and releases the mercury vapors!! I also have heard that the inside of a banana peel works to whiten (also GREAT for itchy insect bites) and activated charcoal…apply from capsule with a designated brush, leave on for a few minutes then rinse. It is said to stain sink, clothing, brush, but whitens teeth really well…just wear a black top!
You may be able to get rid of superficial stains by yourself. A number of at-home tooth-whitening products -- kits, strips, toothpastes, and rinses-- may lighten stains. There are even some old-fashioned remedies you can try. Tooth-whitening products available on drugstore shelves use mild bleach to brighten yellow teeth. Toothpastes use abrasives and chemicals to remove surface stains. For deep stains, you may need a dentist's help.

Further research I’ve done on this showed that activated charcoal can actually be helpful in changing the pH and health of the mouth, and as such is effective in avoiding cavities and killing the bad bacteria present in tooth decay and gingivitis. For this reason, I now suggest and use it as part of my remineralizing protocol for teeth, along with my remineralizing toothpaste.
Choose the right floss. Flossing is one the most important steps in your dental care routine besides brushing.[8] Commercial floss is made from synthetic nylon or plastic filaments. It is often treated with flavoring agents, such as mint or lemon, artificial sweeteners and sugar alcohols, such as xylitol and mannitol, to make flossing more pleasant. They may also be waxed with beeswax or plant-based wax for ease of use. Keep in mind, however, that there is no difference in the effectiveness of waxed or unwaxed floss.
Further research I’ve done on this showed that activated charcoal can actually be helpful in changing the pH and health of the mouth, and as such is effective in avoiding cavities and killing the bad bacteria present in tooth decay and gingivitis. For this reason, I now suggest and use it as part of my remineralizing protocol for teeth, along with my remineralizing toothpaste.
Avoid smoking. Cigarettes and chewing tobacco are harmful to your oral health as they can cause stained teeth, gum disease, oral cancer, slow healing after a tooth extraction or surgery which increases the risk of dry socket, a dulled sense of taste and smell and bad breath.[14] Quitting is the only way to decrease your risk of these and other-tobacco related health problems.

Take calcium supplements. Calcium is essential to forming healthy teeth and bones. The two most popular forms of calcium supplements are calcium citrate and calcium carbonate. Taking vitamin D and magnesium supplements with calcium can help your body absorb and use the calcium more efficiently. Calcium supplements should be taken in very small doses, no more than 500 mg at any given time, in divided doses with six to eight cups of water to avoid constipation.
First, I’m sorry if the article was confusing on this aspect of it. With this part of the article on activated charcoal, we were simply expressing our personal concerns about the potential risks of daily use of activated charcoal. You see, warnings exist against using activated charcoal internally daily because it can inhibit absorption of vitamins and minerals. So, from our perspective, the same warning could be applied to regular use in the mouth.
Calcium supplements derived from oyster shells, dolomite, and bone meal are best avoided as they may contain lead, which can cause anemia, damage to the brain and kidneys, raise blood pressure and cause poisoning. Calculus (tartar) on your teeth may also increase while using these supplements, so visit your dentist for a cleaning whenever you feel the deposits on your lower front teeth.
I have used all of these methods to naturally whiten teeth at one time or another and have found that since most of these are included in my diet or what I use for oral hygiene,  my teeth have remained pretty white and I haven’t had to spend extra trying to whiten them. These ways to naturally whiten teeth can be used daily or weekly to keep your teeth nice and white.
Whitening devices appeared on store shelves approximately two years ago, bringing elements of professional lightening to the user at home. Heat works to accelerate the breakdown of hydrogen peroxide, creating more whitening oxygens. High-intensity lights are required to accelerate the reaction rate of the hydrogen peroxide, meaning users and those in the immediate vicinity must wear protective eyewear. By combining the professional elements of light and heat in a closed system mouthpiece, along with a non-migrating gel, the device calls upon the professional whitening experience. If you are short on time, this device may whiten your teeth in two days. 
I took tetracycline in the 70’s and ended up with a permanent yellowish color to my teeth. Lately I have been brushing my teeth with tooth gel (not toothpaste) and a dipping of the toothbrush in a little hydrogen peroxide at the same time. At first I thought nothing was happening, but after several weeks, I finally looked at my teeth and they were white! I was really surprised. Hopefully they will continue to become whiter. And, now I know you have to be patient!!! I plan to add baking soda, too. BTW, for some reason, toothpaste makes the inside of my mouth slough off, the same as another person mentioned above. So I have to brush with “tooth gel”, which is getting harder and harder to find.
Dip your toothbrush into a sea salt mixture. Instead of using toothpaste, dip your toothbrush into a sea salt mixture for 3–5 minutes, made by dissolving ½ teaspoon of salt in 1 fluid ounce of water, and brush your teeth with it. The salt temporarily increases the pH balance of your mouth, turning it into an alkaline environment in which germs and bacteria cannot survive.
To oil pull, simply put a spoonful of coconut oil in your mouth and swish it between your teeth for five to 20 minutes, or add a few drops to your toothbrush and brush it on. Another oral care option is to apply coconut oil to a corner of a clean washcloth and rub it on the teeth. A bonus regarding coconut pulling? Coconut oil has antimicrobial properties, so it’s great for protecting and cleaning your gums as well.
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