“Amongst the Brute creations, that never open their mouths except for taking their food and drink, their teeth are protected from the air both day and night, and seldom decay; but with Man, who is a talking and laughing animal, exposing his teeth to the air a great portion of the day, and oftentimes during the whole of the night, the results are widely different — he is oftentimes toothless at middle age, and in seven cases in ten, in his grave before he is fifty.”