You're not bad at using your logic to deduce and understand the laws that govern groups of items and ideas together. This is an important cognitive tool we use every day without even thinking about it, and it's important to see that your brain is healthy and able to do it.
The use of amalgam metals in fillings has been going on for 150 years. That said, its use is today being debated. Amalgama Cerámica Plata fundida Resina ¿Para qué se realiza una endodoncia?