I am currently studying to achieve my goal of becoming a dentist.
You make the right choice. It is very rewarding to be a aids in providing oral health services.
It is. I just like the idea of creating a better smile for people everywhere. Smiles are one of the first thing people see when they meet someone. 
That is amazing. Which group will you like to be categorized?  guild of barbers or lay barbers.
That is some ancient history you pulled up, but I would define myself as a lay barber. I want to be involved in fixing everything inside the mouth and helping.
I think  the Guild of Barbers will be cool too because they create to distinguish more educated and qualified dental surgeons from lay barbers.
They both serve a good purpose, but I guess I want to be more involved in the teeth removing and shaving of the teeth when necessary. Both are important nonetheless.
Tooth decay
Tooth decay, also known as dental caries or cavities, is a breakdown of teeth due to acids made by bacteria. The cavities may be a number of different colors from yellow to black. Symptoms may include pain and difficulty with eating. Complications may include inflammation of the tissue around the tooth, tooth loss, and infection or abscess formation.
The cause of cavities is acid from bacteria dissolving the hard tissues of the teeth (enamel, dentin and cementum). The acid is produced by the bacteria
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