Get ready to “Say cheese!” 
Whitening your teeth is one of the safest and better yet, fastest ways to a perfect smile. A bright, gleaming smile is not only a confidence booster, it’s also healthy for you because you will maintain your new smile by following a dentist recommended hygiene.
Before you select a procedure, you will need to visit the dentist to ensure your teeth and mouth are healthy and ready for the whitening.
Bleaching: This type of teeth whitener actually changes the natural shade of the tooth and removes deep stains and well as stain on the surface. Your dentist will protect your gums and your mouth tissue with a gel, and then will apply the bleaching agent to the teeth. Commonly, the agent is a peroxide, and often times the bleaching agent will be activated by a special light system. This method takes between half and hour to an hour, and depending on how dark you teeth are, you may only need one -three sessions.
Your dentist may even custom make you trays for your teeth to use at home, where you can maintain the results periodically by applying the bleaching agent yourself.
How much does whitening cost? Starting at about $500 depending on the method and the number of sessions, and about $400 for a customs at home system to maintain.
A little word on the colour of your teeth. Dentists evaluate your tooth colour based on shades. You can expect an improvement of 5-7 shades and even up to 12.
What about at-home products? These are not very effective as they are low-concentration peroxides and are not custom made for your teeth. Also, a professionally applied tooth whitening system is much more effective so you’ll see results faster.
Many people wonder how often you can whiten your teeth. The answer? It’s a matter of practicality and it all depends on you. Whitening your teeth may make them feel more sensitive, so you will want to be gentle when you whiten and make sure you do not do so too often. Also, you do not want to over-bleach your teeth which can cause them to be discoloured. Use common sense.
If you have specific teeth that do not respond to whitening, there is help: The veneer. A porcelain veneer can be applied to a single tooth that will match the surrounding colour of your other teeth, giving you a beautiful glowing smile.