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Overbite vs. Overjet: How Can You Tell the Difference - and Can Clear Aligners Help?

Did you know that while the terms overjet and overbite may often be used interchangeably, they are actually totally different dental issues? Here, our Summerside dentists explain the difference and how we can use clear aligners to help address them.

What are overbites and overjets?

Overbites and overjets are two of the most common orthodontic issues. Though the terms are often used interchangeably, there are distinct differences between these two conditions.

Overbite

Overbites are also commonly called deep bites. They happen when a third of the lower incisors in a mouth are covered by the upper front teeth while the mouth is closed. Ther vertical nature of this health issues is what distinguishes it from overjets. 

Overjet

Commonly called “buck teeth” an overjet is when the upper front teeth protrude over the bottom teeth, creating a significant horizontal overlap.

It's normal for your upper front teeth to rest a little bit in front of your lower teeth when closing your mouth. However, any space of more than 2 millimetres will likely cause issues. 

Overbites are vertical, while overjets are horizontal and cause the upper teeth to protrude past the bottom teeth at an angle. But with an overbite, the teeth remain downward or straight (not on an angle).

How are overbite and overjet caused?

The most common causes for overbite is that the lower jaw is somewhat smaller than the upper jaw, resulting in the lower teeth resting behind the upper teeth and moving downwards as wear on your teeth takes place.

More gum will tend to show on your upper teeth, and your upper front teeth sit slightly lower than the teeth beside them (upper side teeth, or canines).

Overbites can occur if a patient had a tongue-thrusting habit or was permitted to suck on an object - usually a pacifier or thumb - for too long as a child. Biting the nails or chewing on objects such as erasers or pens can also cause this issue.

Similar to overbites, childhood habits such as thumb sucking can cause overjet if they continue while adult teeth start to emerge. Another common cause of this condition is that the lower jaw bone isn't able to keep up with the development of the forward growth of the upper jawbone. This disparity in the fourth results in the bottom jawbone ending up set back from where it should be.

Genetic factors can also cause overbite or overjet.

What dental problems can overbite and overjet create?

In extreme cases of overbite, the lower teeth may touch the gum tissue behind the upper front teeth, creating wear on the teeth and gum tissue.

When you have an overjet, your risk of damaging your teeth or fracturing them will increase. Some overjets aren't really noticeable since they are moderate, while other can be quite a bit more serious and may even make it difficult for your lips to close completely because of the poor alignment of your smile.

You may also notice challenges with chewing or biting.

Can an overbite or overjet be treated with clear aligners?

If the overbite or overjet is skeletal in nature, we would not recommend clear aligners and instead suggest speaking to your dentist to explore other options, such as surgery.

However, if the overjet or overbite is caused by one of the issues listed above, we may be able to treat the problem with clear aligners. The aligners will apply gradual pressure to your teeth to move them into corrected positions as prescribed by your dentist in a custom treatment plan. This will leave you with a straighter, more symmetrical smile.

The clear aligners also move your gum at the same time, keeping proportions in check. You will need to wear your clear aligners for about 22 hours each day, removing them to brush, floss, eat and drink.

Your teeth will progressively shift with the aligners, and you’ll switch to a new set approximately every two weeks. Your custom treatment plan could involve wearing as many as 26 trays, which equates to one tray every two weeks for 12 months.

Before you start your treatment, your dentist will be able to show you a preview of how your new smile will look by the end of your treatment. Take the first step to schedule a consultation with your dentist to learn if you are a candidate for clear aligners.

Would you like to find out whether clear aligners would help fix your overbite or overjet? Contact our Summerside dentists to book a consultation today.

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