Carbamide peroxide teeth whitening side effects.

Carbamide peroxide is used for teeth whitening very often. But it’s excessive use can lead to some serious problems to your teeth. Carbamide peroxide is more of a bleaching agent rather than whitening agent. Bleaching agent means it changes the shade of enamel while whitening agents only remove stains from tooth surface.

Carbamide peroxide acts on the enamel layer of teeth and change the shade of it by interacting with the components of enamel inside it. It’s not a fast way to whiten your teeth instead, it acts in 1-2 hours. While Hydrogen peroxide acts very fast as compared to Carbamide peroxide.

How Carbamide peroxide is used on teeth?

Carbamide peroxide is applied on the teeth by dentist with a brush. It’s present in form of gel or some form of thick liquid. Some also use a tray to set on the teeth and leave it for some time. It should be applied on teeth for 2-5 hours depending upon the concentration of acid in it.

Results don’t came immediately after only one attempt. You can repeat the procedure every day until teeth attain the level of whitening you want. Don’t leave the gel on your teeth overnight as it may cause sensitivity. 

Side effects:

1. Gum irritation/burn

3. Tooth sensitivity 

2. caries

4. Ulcers in oesophagus

5. Uneven/blotchy tooth surface

6. Brittle tooth

Gum irritation/ Burn:

Gum irritation is caused by excessive use of Carbamide Peroxide on teeth. Sometime, this compound leaks out of the tray and spread all over the gums surrounding the teeth which may cause redness on gums and burning sensation.

Gums are just the soft tissues, can’t handle the acidic properties of Carbamide Peroxide. Make sure, you don’t leave small amount of the whitening agent on soft tissues. The tissues will got red and burning sensation. Do following precautions if you got gums irritation.

1. Apply some ice cubes on red area of gums

2. Don’t eat spicy food

3. Remove tray from your mouth and drink lot of water

4. Wash your gums with water

Tooth Sensitivity:

The most common side effects patients feel after Carbamide Peroxide use is tooth Sensitivity. Carbamide Peroxide acts on components of enamel and resins present inside it which can abrade some of the enamel from your teeth.

Enamel is the most important protective layer on teeth and it can’t grow back unlike the dentin. Once, dentin is exposed, sensitivity will be the problem for a very long time. You should use the whitening agent very carefully.

Stop it’s use when you feel a slight chance of sensitivity. As it can lead to dentin caries. Contact your dentist for this issue. If there is pain at that time, have ibuprofen tablet or apply something pain reliever on teeth.

Sensitivity can’t be treated very easily without further dental treatment. Your dentist will recommend you Veneers, or crowns for long term effect to save your teeth. Veneers and crowns will save your teeth for more than 10 years if applied effectively.

Pain relievers if sensitivity got worsen:






Carbamide Peroxide can lead to enamel damage will is an ultimate step to dentin exposure. Once dentin got exposed, there is no barrier like enamel. Bacteria inside the oral cavity will affect the teeth and already present Carbamide peroxide with it’s acidic effect will cause dentinal caries.

To prevent teeth from caries, immediately appoint yourself to your dentist and got yourself checked if there is any need of further dental treatment like Veneers or crowns. 

Ulcers in oesophagus:

Some people swallow the paste, gel they are applying on teeth surface as a whitening agent. Which has caused throat ulcers in them. Carbamide Peroxide isn’t a neutral compound. It’s acidic in nature and can lead to burning sensation in oesophagus too.

To treat this, first apply gel on your teeth very carefully and in small amount. Don’t use in excess. Don’t eat spicy food. If there is some serious problem which isn’t healing in two days, consult your doctor. He will do endoscopy to see how much damage has been done.

Blotchy tooth surface:

Acidic compound can cause blotchy and uneven tooth surface. This happens if you’ve applied Carbamide Peroxide for more than enough time or used in excessive amount. 

Blotchy surface is due to enamel damage on teeth for prolong use of Carbamide peroxide. Hydrogen peroxide can also cause blotchy surface. Instead of whitening, teeth got stained on rough surface of teeth. It can be treated by Veneers.

Brittle Tooth:

Enamel is the hardest layer on teeth. Which prevent the whole structure from caries, trauma and infection. Without it, chances of dentin and pulp exposure increases significantly. If caries spread beneath the pulp and damage the blood supply.

Tooth become so brittle as their is no blood supply to the teeth. Whole structure will break with a slight external trauma. Brittle tooth can lead to BDR in which clinical portion of tooth break down and remaining root can be lead to pain.

Crowns are the best option if possible, otherwise tooth has to be extracted.

Why do teeth colour change?

There are multiple reasons of colour changes.

1. Natural:

Some people have yellow teeth from beginning. It’s because the enamel on their teeth isn’t that thick to cover the yellowish appearance of dentin beneath it. Dentin is slightly yellow in colour. So if enamel layer is thin, dentin’s colour become visible.

2. Food:

Some foods like coffee, tea, chocolates and some other pigmented eatables do cause some staining on enamel layer of the teeth. Pigments got attached to the upper layer of dentition and change white colour of teeth into yellow or brown.

It’s always recommended that you brush your teeth two times a day and especially after heavy dinner or breakfast. Remaining food can also cause pigmentation on your teeth which looks bad aesthetically from front.

3. Carbonated drinks:

Carbonated drinks can also lead to colour change. Especially, the acidic part present in drinks dissolve the enamel on teeth with time. Which can lead to blotchy, uneven surface of tooth. The condition seems similar to fluorosis.

4. Fluoride excess:

Fluoride excess in water can also lead to discoloured enamel. It increases the strength of teeth but on other hand, might lead colour change from white to yellowish, brown. To prevent your teeth from this situation, clean your water and don’t drink excessive fluoride containing water. 

5.Tobacco use:

Cigarette smokers, hukkah and stuff like that which contacts tobacco have greater chances to develop coloured teeth than others. Tobacco consists of two major components which leads to colour change in teeth.Tobacco is injurious to health

Tar and Nicotine. These compounds interact with other ones and create a different colour in teeth. Tar is coloured one which caused dark brown teeth while nicotine is colourless but it can change the white colour after interacting with Oxygen inside oral cavity.

6. External trauma:

Trauma might lead to many complications including colour change. Sometime it can causes necrosis of teeth in which white colour of teeth converts into dark brown. Once, necrosis starts, teeth colour would change immediately as there will no blood supply.

7. Caries:

Dentinal caries, deep caries, root caries, all changes the colour of teeth. Some deep caries show black segments on teeth. Black segments on teeth can be detected easily with naked eye which can be arrested or active.

8. Age:

Over age, outer layer of teeth got thinned by brushing, eating. Dentin beneath the outer layer shows off in older patients. That might also lead to yellowish teeth.

9. Forceful brushing:

Some people do brushing with too much force. They abrade their outer layer of teeth which can lead to colour change.

10. Drugs and Medications:

Young patients can got discoloured teeth after taking Tetracycline. Other drugs that can cause this situation are antihistamine, antipsychotic, and high blood pressure medicines. Radiations can also lead to discoloured teeth.

Other cosmetic dental procedures to whiten your teeth:

Laser technology is advanced technology that can brighten your teeth up-to 10 shades. It’s time consuming and lot more effective than bleaching agents. Bleaching agents can be take more than 2 hours while laser treatment just takes less than hour.

In this technique, first gel is applied on tooth and then laser rays are used to generate some energy which whitens the teeth. After the whole procedure, patient is advised to strictly follow the diet plan and avoid foods like coffee, tea etc.

Crowns and Veneers:

Darker shades of teeth can’t be whitened very easily with bleaching agents and laser technology. For them, Veneers and crowns are the best option. Veneers add a layer onto the tooth which means it’s not interacting with teeth portion.

It’s just an extra layer on the teeth. After Veneers and Crowns, you should also take care of them as both of them can also got pigmentation with food and drinks like coffee, tea, carbonated drinks. Crowns and Veneers are little expensive than bleaching agents.

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