There are more serious conditions such as heart disease and Parkinson's disease and even to the extreme, certain types of Cancer.
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What initially began as a sort of tall, broad, bell curve-shaped ridge (in the faciolingual dimension) eventually becomes a short, narrow, stumpy sort of what doesn't even appear to be a ridge.
Mr. Larsson, a Swede who was edentulous at the time and had been born with severe chin and jaw deformities, agreed to the test because he wanted to have teeth again.