Toothpaste for Underarms: How Long Does it Take to Work?

Toothpaste works to lighten dark underarms! Yes it is. But how long does it take to lighten underarms with toothpaste?

It will take three to five days to lighten your underarms with toothpaste. However, dark underarms are embarrassing and a hindrance to dressing in some way, like sleeveless or tube tops.

Darkening of skin on folds can result from a medical condition known as Acanthosis nigricans. It causes the skin to thicken in folds, hence making it dark. Other causes of dark skin are shaving excess, sweat, or dead skin build-up. You can lighten dark underarms with white toothpaste and avoid gel or colored options as they contain abrasive chemicals that can irritate sensitive skin.

How to lighten dark underarms

If you’re thinking, my underarms are very black for that perfect, sleeveless dress, don’t lose hope yet. You can use Colgate and lemon for underarms to lighten them and rock that fancy dress without worrying about embarrassment.

Let’s explore different ways to lighten underarms.

Use white toothpaste

As mentioned earlier, white toothpaste can be the ideal choice to lighten your underarms fast and effectively. However, while you work to lighten your underarms with toothpaste, pay attention to cleanliness; apply toothpaste on clean skin and use warm water to rinse it off.

To get quick results, repeat the following process until results are evident, and then stop.


  1. Squeeze a good amount of white toothpaste on your fingers.
  2. Spread the toothpaste evenly on your underarms, rubbing it in thoroughly.
  3. Leave it there for about 10 minutes before washing it off.
  4. Use warm water to wash it off.
  5. Pat the skin dry, and then apply a moisturizer like Vaseline for dark underarms.
  6. Depending on the condition of your skin, repeat the entire process twice-weekly.

Colgate and baking soda for underarms are ideal for you if fast results are what you seek. Both toothpaste and baking soda have bleaching properties. In addition, baking soda deactivates bacteria and foul odor, and when you mix both, they work to lighten your underarms faster.

Another home remedy includes toothpaste lime and turmeric for underarms. These natural ingredients are whitening agents. Don’t forget to rinse off, dry, and apply moisturizer to soothe your skin.

How long does it take for toothpaste to work?

Depending on the problem, it can take three to seven days of applying toothpaste to work on your underarms.

In its initial purpose, toothpaste works by scrubbing plaque off the tooth surface and removing food debris without causing damage to the enamel, meaning the effect is immediate.

Most toothpaste options have fluoride, which prevents the enamel from damage, and other antimicrobial ingredients that prevent plaque formation. 

Some toothpaste brands contain baking soda, making it effective for removing stains. However, only use such brands when necessary. Further, stop using the toothpaste when stains are clear to avoid the effects of brushing with baking soda, like tooth sensitivity. Moreover, tooth sensitivity can also be part of the side effects of using whitening toothpaste excessively.

Proper dental hygiene doesn’t come about by leaving toothpaste on teeth overnight, rather through brushing twice daily. The same way, leave toothpaste on your underarms only for the recommended time.

How to use toothpaste for underarms?

Using toothpaste for underarms is an easy pie, especially when you mix it with other whitening agents like turmeric, baking soda, and lemon juice. As long as the cause of your dark underarms isn’t a medical condition, toothpaste can lighten them in a simple procedure.

Before using toothpaste for any skin, check its ingredients and what effects they can bring to your skin. This is because the product’s primary purpose is oral hygiene, meaning its benefits focus on cleaning teeth and gum. Some ingredients in toothpaste are abrasive enough to irritate the skin and should not be used, no matter where the advice comes from.

Further, note that hyperpigmentation can be challenging to treat, especially if you have dark skin. Therefore, don’t rush the process or overdo it to get fast results because it can damage your skin.

If your armpits are incredibly dark and concern you, a dark underarms treatment dermatologist can help you determine. The discoloration can be from Acanthosis nigricans, a medical condition that thickens the skin, causing it to be dark. But, if that’s not the cause, alternative underarm lightning solutions covered in this post should suffice!

But for now, let’s walk together through the different home toothpaste remedies to lighten underarms. 

Toothpaste with lemon

On its own, toothpaste is a whitening agent, and lemon contains antibacterial properties. When both are combined, they lighten underarms.


  • Four teaspoons of lemon juice
  • A small bowl
  • White toothpaste


  1. Mix the lemon juice and a reasonable amount of toothpaste in the bowl to a smooth paste.
  2. Scoop the paste with your fingers and spread it on your underarms evenly. 
  3. Allow it to sit there for five to seven minutes, then wash it off using a cleanser.

Toothpaste and tomato

Thanks to the lycopene in tomato juice, it unclogs pores to reduce the discoloration of underarms. Therefore, mixing it with toothpaste makes sit work better to deliver fast results.


  • Tomato juice
  • White toothpaste
  • A bowl


  1. Put three tablespoons of tomato juice and a generous amount of toothpaste in the bowl and mix them to a smooth paste.
  2. Apply the paste on dark armpits using your fingertips. Leave it for about five minutes, and then wash it with lukewarm water until clean.

Toothpaste with baking soda and rice powder

A mix of these three ingredients works wonders. Besides lightening underarms, the remedy also fights bacteria and bad odor, while the rice powder is a skin-whitening agent.


  • Baking soda
  • Rice powder
  • Apple cider vinegar
  • White toothpaste
  • A bowl
  • A spoon


  1. Mix one tablespoon of baking soda, two teaspoons of rice powder, two tablespoons of apple cider, and a generous amount of toothpaste. Stir the ingredients to a smooth paste.
  2. Using your fingers, spread the paste generously on the dark skin and let it sit for about seven minutes.
  3. After seven minutes, wash off with a cleanser.

Effects of using toothpaste for underarms

The effects of using toothpaste for underarms vary depending on brand, ingredients and use. Some of these toothpaste brands contain harmful ingredients that are dangerous to your health when slowly absorbed.

Toothpaste is absorbed through the skin into the bloodstream, and in excess, toxins gather in sensitive organs like the liver, kidneys, lungs, and heart and can be fatal in extreme cases.

The toxic chemicals in toothpaste are triclosan, Sodium Lauryl Sulfate (SLS), sodium fluoride, and hydrated silica. Other sophisticated dental products contain Federal Drug & Cosmetic (FD&C) Blue Dye that triggers allergies, cancer, headaches, and asthma.

Use enough quantity for the intended purpose to avoid irritation two to three times a week, and don’t use it if you have broken skin or cuts. Here are some safety tips to observe.

  • Only use enough toothpaste to get the desired paste consistency.
  • White toothpaste is recommended for dark underarms because it has little or no abrasives that can irritate your skin.
  • Don’t use any of the above remedies if you’ve cuts or broken skin.
  • Before applying to the underarm skin, do a patch test to determine how your skin reacts.

Important Note:

Before applying toothpaste to your armpits, there’s a chance of irritation. Yes. Even food products can irritate your skin. Remember that armpits or skin folds are fragile, and you should not apply harsh solutions or pastes that will trigger an allergic reaction and worsen the situation.

To avoid this scenario, do a patch test, apply a small amount of the remedy, wash it off after the recommended time, and see how your skin reacts in 48 hours. You can lighten your underarms with toothpaste if there are no signs of irritation.

Frequently Asked Questions (FAQs)

How does toothpaste work to remove sweat and dirt from underarms?

White toothpaste is a bleaching agent which removes all build-up in skin or cells to leave your underarms clean and light. Therefore, ensure that you use only white toothpaste to avoid toxins and dyes that can irritate sensitive skin. 

Can I also use deodorant with my toothpaste routine for underarms?

No. Wait 48 hours before using deodorant after using toothpaste to lighten dark underarms. This is because the toothpaste routine works by unclogging pores, leaving them open, meaning the absorption rate is high, and the deodorant chemicals might trigger irritations.

Should I use a gel or liquid toothpaste for underarm use?

Avoid gel or liquid toothpaste for underarm use. This is because toothpaste can contain toxic ingredients that irritate your skin. For this reason, only white toothpaste is recommended for whitening underarms.

What should I do if my skin becomes irritated after applying toothpaste to my arms?

Although toothpaste allergies are uncommon, they can happen. Once you notice your toothpaste is causing irritation signs like itching, burning, or skin peeling, discontinue use immediately. Wash the affected area, pat it to dry them apply a moisturizer to calm the skin.

Final Verdict

Accumulation of dead skin cells can cause your dark armpits over time. The dead skin cells cause clogged pores. Hence your skin cannot breathe, resulting in dark underarms. This way, exfoliating the dead skin cells will leave your underarms feeling fresh and lighter.

To achieve light underarms, white toothpaste alone or with a few natural ingredients can make it happen for you. And if you’re asking, how long does it take to lighten underarms with toothpaste, it will take you only 3 to seven days to get the dead skin off the epidermis and leave it clear.

Hence, your underarms will be lighter after a few sessions of applying white toothpaste to your underarms.

Leave a Reply

Your email address will not be published. Required fields are marked *

About Us

You certainly can’t believe everything the Internet tells you. Kelvin David knows this better than anyone. A few years ago, Kelvin decided to try online shopping for the first time. He was looking for a new electric drill he could use on his daily work as a contractor.