The Pros and Cons of Leaving Sensodyne on Teeth Overnight

Sensitive teeth can be a real pain. The slightest touch of hot or cold can send a wave of discomfort shooting through your mouth, making eating and drinking an unpleasant experience. Sensodyne toothpaste has long been a trusted solution for people with this issue, and many have found relief from their sensitive teeth by using it regularly. But have you ever wondered what would happen if you left Sensodyne on your teeth overnight? In this blog post, we’ll explore the pros and cons of this practice.

What is Sensodyne?

If you suffer from tooth sensitivity, then you might have heard of Sensodyne. Sensodyne is a popular toothpaste brand that is specifically designed to help alleviate tooth sensitivity. GlaxoSmithKline, a British pharmaceutical company, manufactures it.

How Sensodyne Works

Sensodyne toothpaste is specially formulated to help relieve tooth sensitivity. It works by creating a barrier on your teeth that blocks the pain signals from reaching the nerves. The active ingredient in Sensodyne toothpaste is potassium nitrate, which helps to desensitize the nerves in your teeth.

Ingredients in Sensodyne Toothpaste

In addition to potassium nitrate, Sensodyne toothpaste contains other ingredients that help to clean and protect your teeth. These include:

  • Fluoride: helps to prevent tooth decay and strengthen tooth enamel
  • Sodium lauryl sulfate: a foaming agent that helps to remove plaque and food particles from your teeth
  • Glycerin: a moisturizing agent that helps to keep your mouth hydrated


1. Increased effectiveness

One benefit of leaving Sensodyne on your teeth overnight is that it allows the toothpaste more time to work its magic. Sensodyne contains potassium nitrate, which helps desensitize the nerves in your teeth and relieve sensitivity over time. By leaving the toothpaste on your teeth for a longer period of time, you might find that your sensitivity improves more quickly.

2. Protection against enamel erosion

Another potential benefit of leaving Sensodyne on your teeth overnight is that it can help to protect your tooth enamel. Sensodyne contains fluoride, a mineral that strengthens tooth enamel and helps prevent decay. By leaving the toothpaste on your teeth overnight, you may be providing extra protection to your teeth while you sleep.

Interesting Read: Can Sensodyne make your teeth hurt?


Some dentists recommend applying a thin film of Sensodyne to the sore tooth near the gum line before bed and leaving it on overnight. This can help desensitize your teeth while you sleep. However, it’s important to note that Sensodyne is not meant to be a replacement for proper brushing and flossing. Keeping it on your teeth all night can actually cause damage to your teeth and gums.

1. Risk of dry mouth

One potential downside of leaving Sensodyne on your teeth overnight is that it can cause a dry mouth. This is because toothpaste can absorb moisture from your mouth, leaving it feeling parched in the morning. A dry mouth can increase the risk of tooth decay, so it’s important to take steps to keep your mouth hydrated if you decide to leave Sensodyne on your teeth overnight.

2. Risk of tooth sensitivity

Sensodyne is designed to help relieve tooth sensitivity, but leaving it on your teeth overnight could actually have the opposite effect. This is because the toothpaste contains abrasive ingredients that can wear down your tooth enamel if left on for too long. Over time, this can actually make your teeth more sensitive instead of less, which is definitely not the effect you’re looking for.

3. Risk of ingestion

Finally, leaving Sensodyne on your teeth for an extended period of time increases the risk of swallowing some of the toothpaste. While Sensodyne is generally considered safe to ingest in small amounts, consuming large amounts of fluoride can be harmful to your health. If you leave Sensodyne on your teeth overnight, rinse your mouth thoroughly with water before going to bed to minimize the risk of accidental ingestion.

So, while leaving Sensodyne on your teeth overnight may provide some relief, it’s not a long-term solution. You should always follow your dentist’s recommendations for proper oral hygiene, including brushing twice a day and flossing daily. If you’re experiencing tooth sensitivity, it’s important to talk to your dentist to determine the underlying cause and the best course of treatment.

Frequently Asked Questions

If you are experiencing tooth sensitivity, you may have considered using Sensodyne toothpaste. However, you may be wondering if it is safe to leave Sensodyne on your teeth overnight. Here are some frequently asked questions to help you understand the potential risks and benefits.

Will leave Sensodyne on your teeth overnight damage your teeth?

No, leaving Sensodyne on your teeth overnight is unlikely to cause any damage to your teeth. Sensodyne is a gentle toothpaste that is designed to be used every day. However, if you have any concerns, you should speak to your dentist.

How should you apply Sensodyne before bed?

To apply Sensodyne before bed, simply brush your teeth as you normally would, making sure to cover all surfaces of your teeth. Spit out the excess toothpaste, but do not rinse your mouth with water. This will allow Sensodyne to continue working while you sleep. If you have a retainer, you can also apply a small amount of Sensodyne to the retainer and wear it overnight.

Can Sensodyne cause any side effects?

Like any toothpaste, Sensodyne can cause side effects in some people. The most common side effect is mild irritation or sensitivity in the mouth. This usually goes away on its own after a few days of use. However, if you experience any severe side effects, such as swelling or difficulty breathing, you should stop using the toothpaste and seek medical attention.


So, should you leave Sensodyne on your teeth overnight? Ultimately, deciding what works best for your dental health is up to you. While this practice has potential benefits, there are also risks to consider. If you decide to leave Sensodyne on your teeth overnight, keep your mouth hydrated, be mindful of how long you leave it on, and rinse your mouth thoroughly before going to bed. As always, it’s important to consult with your dentist if you have any concerns about your teeth or oral health.

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