The teen deodorant has got to be effective smell good and be safe.
Unlike a natural teen deodorant, mainstream teen deodorants and antiperspirants can have potentially dangerous chemicals such as:
Parabens: which have a lot of different uses in a wide variety of products and even food, the primarily use is as a preservative, anti-fungal and for its bactericidal effects. There is thought to be a link between using deodorants/ teen deodorants containing parabens and musume 1 on pov tube breast cancer.

The way it was explained to me is that parabens can mimic the hormone estrogen which has been verified to play a role in breast cancer. Even some natural teen deodorants contain parabens so be sure to read the label.
Propylene Glycol: is a main ingredient also contained in even so called "natural deodorants and teen deodorants" which is also used to make anti freeze. Propylene Glycol enters the skin so quickly that the EPA has warned factory workers to avoid skin contact in order to prevent brain, liver, and kidney abnormalities.

This is not a chemical you want in your teens deodorant.
Aluminum: There is a thought that the Aluminum contained in antiperspirants and some teen deodorants may be linked with Alzheimer's disease. Natural teen deodorants shouldn't contain it as aluminum is only in antiperspirants. What researchers have found is that some forms of aluminum when found in the brain can cause the neurological damage associated with Alzheimer's disease.

Whether or not the aluminum found in antiperspirants and teen deodorants causes increases in aluminum content of the brain, still needs to be determined. Aluminum is one of the most toxic substances to humans. Aluminum damages nervous systems in both infants and adults.

It is linked in anemia, osteomalacia, glucose intolerance, memory deficits, and Alzheimer's, Lou Gehrig's (amyotrophic lateral sclerosis), and Parkinson's diseases. They do know that aluminum is extremely toxic to the human nervous systems and should be avoided.
Humans also absorb aluminum through the skin: a 2001 study showed that aluminum was still present in blood samples 15 days after one application of aluminum to the armpit. Again, a natural teen deodorant shouldn't have any aluminum.