service in supporting and steadying artificial

ones.

Ligatures should not be used to fasten artificial teeth; they should be so constructed as to be removed as easily as a glove, and yet be perfectly secure and steady in the mouth; objects which can only be attained by a Dentist who perfectly understands his profession.

In all cases, by very great accuracy of fitting on the model, and a correct adaptation to the mouth, fastenings with clasps or ligatures are rendered unnecessary.

In cases where there is absorption or loss of substance, a very great change takes place in the appearance and expression of the countenance. It is not the fact that the change in the form of the lower jaw is the result of old age, for it is rather the inevitable result of the total loss of the teeth. Thus old persons having preserved them, have the angle

of the jaw nearly acute, and the chin scarcely projecting; whilst we meet with many adults who have lost all their teeth at an EARLY AGE, and who have nevertheless the entire physiognomy of OLD AGE-See the Engraving.

This absorption occurs more or less in all cases; and to ascertain the extent of such loss of substance is very important previously to supplying artificial teeth; as, by a judicious arrangement of the material, in making good such losses with artificial gum as well as teeth, where the loss is considerable, depends that perfect restoration of the features to their natural symmetry, which the art of Dentistry is capable of giving.

By attention to the above, any degree of fulness of the lips or cheeks can be obtained, without inconvenience to the wearer.

Much has been said with respect to the comparative merits of bone or gold as the

frame for artificial teeth; some Dentists using bone in every case, however inapplicable; others using gold, although perhaps equally so, in that particular case.

An invariable adherence to either plan, deprives the person seeking assistance of those comforts and great advantages which the art of a skilful Dentist is capable of affording.

Ivory, or the tusk of the Hippopotamus, soon decomposes, and, notwithstanding the greatest care and cleanliness, will not last long.

It is in all cases desirable to place as little in the mouth as possible, that the articulation and mastication may be performed with more freedom.

Gold of the finest quality can be used with the greatest advantage, as it may be thin and small in size, and yet possess infinitely more

durability than Ivory, which, when made thin, is very soon destroyed, and therefore, from the necessity of frequently renewing it, becomes expensive.

The teeth that are usually supplied by Dentists, are either natural or mineral.

Natural teeth have been long employed by the most celebrated Dentists, and with great success as regards appearance and utility; but with respect to their durability, the time they will last varies according to the constitution of the wearer, notwithstanding their handsome appearance when first placed in the mouth.

Some persons of extreme sensibility and delicacy of feeling, will not wear natural teeth under any circumstances; although there is not any rational objection to their use, as there is not any real difference between them. and ivory.

Many persons, however, do object to wear them; and their being liable to decompose and become discoloured in so short a time, induced me to bestow much time and study to find a substitute which should combine an equally natural appearance and utility, with much greater durability.

This most desirable object is now attained, by my having invented a new description of Composition Teeth, composed of siliceous substances, with a very fine enamel upon them, which admits of every variety of shade and colour, and enables me to match, with the greatest nicety, both in form and colour, any teeth that may remain in the mouth.

They are perfectly Incorrodible, and cannot be affected in any way by the saliva, heat of the stomach, or acids of any kind; IN SHORT, THEIR DURABILITY IS UNBOUNDED, AS THEY WILL NEVER DECAY OR BECOME THE LEAST DISCOLOURED, AND WILL APPEAR AS WELL