No, a Dentist cannot visualize the bottom part of the throat. The area you are describing is more in the top of the esophagus area. The have a great view of the back of your throat (tonsil area) but not the part you are describing. Chronic sore throats in this area are often times caused by acid reflux.
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No, the area that you feel when you swallow is not visable. Sometimes, viruses and bacteria will cause the tonsils to become red, swollen, and irritated and the whole back part of the throat to become red and irritated, but what you feel when you swallow is not visable.