There are several various ways how that dentists can bleach your teeth. These are divided into external (where the bleach is placed outside of the tooth) and internal techniques (where the bleach is placed inside the tooth).
External bleaching means that the color of the teeth is lightened by placing a bleaching gel on the outer surfaces of the teeth. Once more, using bleaching gels in this way may not work for certain types of discoloration, such as that caused by metal fillings or damaged blood vessels inside a tooth.
There are two ways to do external bleaching:
* "Home" bleaching - is a method that is work similar to the OTC kit technique, but there are two main differences. Initially, your dentist makes the rubber mouthguards so that they fit your teeth exactly, after that, the bleaching gel becomes stronger so it likely to be more effective. You will get from your dentist tubes of bleaching gel and instructions on how to put the gel in the mouthguards. You will necessitate wearing the mouthguards for a few hours daily. It may take a few weeks to reach the color that you want. Consult your dentist for thorough instructions.
* In the surgery – this method is also known as "laser" or "power" bleaching. Your dentist will put a rubber seal around your teeth to protect your gums. Then, the bleaching gel is painted onto your teeth and a special, bright light is pointed at them. This light accelerates the whitening process. The procedure takes one to two hours.
This means that the color of a tooth is lightened by inserting a bleaching product inside the tooth. Internal bleaching can only be done on teeth that have been effectively root treated. This means that the blood vessels and nerves inside the tooth have been reinstated with a rubber filling.
To bleach a tooth in this way, the dentist will make a hole (if it is a front tooth, the hole will be on the back so that you can't see it) and put the bleaching product into the hole. The hole will be sealed with an impermanent filling, leaving the bleach inside the tooth. The procedure is not painful because the tooth has no nerve inside it.
You'll have to revisit your dentist about a week later to have the temporary filling and bleach removed. If you are satisfied with the new shade, your dentist will fill the hole with a tooth-colored filling. Sometimes, the color hasn't lightened enough, and the process needs to be repeated. Occasionally, internal bleaching needs to be combined with other whitening techniques to achieve the desired effect.