Combined with proper home care and regular dental visits, sealants are extremely effective in preventing tooth decay. They will also potentially save you a lot of time in a dental chair later on, if your teeth start to require fillings, crowns, or even root canals.
The average age is 12, but this does not mean that all girls start at the same age. A girl can start her period anytime between the ages of eight and 15. Usually, the first period starts about two years after breasts first start to grow. If a girl has not had her first period by age 15, or if it has been more than two to three years since breast growth started, she should see a doctor.
Menarche is another name for the beginning of menstruation. In the United States, the average age a girl starts menstruating is 12. However, this does not mean that all girls start at the same age. A girl can begin menstruating anytime between the ages of 8 and 16. Menstruation will not occur until all parts of a girl's reproductive system have matured and are working together.