After completing dental school, a student who wishes to become an orthodontist must enter an orthodontic specialty program. This training requires a minimum of two years to complete, and in some cases may take longer.
A tablet is a wireless, portable personal computer with a touchscreen interface. The tablet form factor is typically smaller than a notebook computer, but larger than a smartphone.
A laptop, also called a notebook, is a portable personal computer with a clamshell form factor, suitable for mobile use. Although there was a distinction between laptops and notebooks (the former were bigger and heavier than the latter), there is often no longer any difference, in practice.