• Age less than 16 years old
• Sensitive teeth : teeth  whitening usually increase sensitivity and use it on sensitive teeth will increase the problem.
• During pregnancy and breast feeding
• Gum +Periodontal inflammation
• Presence of restorations and crowns because whitening cannot be done on restorations or crowns.

Usually  we need  only  two sessions:

first session for teeth reduction and take impression

and second one for fixation , but that depend on teeth situationif they need treatment or restorations before , so better to visit dentistto evaluate the teeth .

1. Removal of plaque (soft or solid)      
2. Removal of stains that occur because of food debris and stains of coffee and tea                   
3. Return  teeth to its normal colour
4. Kills harmful bacteria that stuck between plaque layers
5. Eliminate bad smells that occur because of bacteria accumulation in mouth
6. Prevent teeth decay , periodontal problems and gum bleeding
7. Prevent gingival pocket that occur because of accumulation of plaque that leads to teeth falling and pain in case if we didn’t treat it

You should visit your dentist once every 6 months to do teeth cleaning and regular check up .

A. They typically get 20 "baby" teeth.

A. Typically if they'll let you hold it in their mouth, that would be best, but a very close second is if you do it in your mouth and explain to them how you are getting all the surfaces inside, outside and top and bottom.

A. Obviously limit sugary foods, but also be careful of starchy foods such as bread or even fruit, that make break down or contain sugar. Gummy candies and sodas last on the teeth for a while and should be limited as well. Milk is good because it contains calcium for the development of the children's teeth.

 If you can, start with a wet gauze as soon as they are born, wiping their teeth or gums to get them in the habit.

As soon as the child has their first "permanent" molar, typically after 6 years old, is when orthodontists will consider putting some type of braces or beginning some type of treatment. If there is a skeletal discrepancy, and the jaws don't line up, then it's easier to use the growth of the child to gently guide the position of the teeth and jaws while the child is young and the bone is less dense, so it moves easier. Some dentists will wait until age 12 or 13 if the child doesn't have any major problems, to "fine-tune" the bite, and make sure the teeth align themselves well for maximal chewing function.

get it securely positioned within a few minutes. If it's a couple hours, the socket probably already has started to seal up and it is unlikely that we can reuse the tooth. It's always worth a try, however. Keep it in MILK to prevent it from being chemically drained or infected (milk has a similar pH level as that of saliva). Don't rinse the tooth off or scrub it. Leave the tissue on the tooth and let the dentist decide what needs to stay or come off.