220                              Laws of Maryland                       [Ch. 176

of any sign shall be of an enclosed lamp design, non-flashing and
containing no colored illumination.

17.    Who deemed to be practicing dentistry.

Any person shall be deemed to be practicing dentistry, within the
meaning of this article, (a) who is a manager, proprietor, or con-
ductor of, or an operator in, any place in which any dental service
or any dental operation is performed within the mouth of any per-
son; or (b) who for a fee, salary, or other remuneration or reward,
paid or to be paid to himself or to another, or gratuitously or other-
wise, performs any such service or operation; or (c) who diagnoses
or treats, or attempts to diagnose or treat, any disease, lesion,
malocclusion, or malposition of a tooth, gum or jaw, in any person,
mechanically, medicinally, [by use of X-ray,] or otherwise; or (d)
who attempts to perform in the mouth of any person any operation
incident to the repair or replacement of a tooth or teeth; or (e) who
publicly or privately applies to himself the title "Dentist" [or "Den-
tal Surgeon"] or uses the letters D.D.S. or D.M.D. or Dr., or any
other titles or letters in connection with his name which, in any
way, represent him as being competent or ready to perform any
dental service or any dental operation in any human mouth [.]; or
(f) who furnishes, supplies, constructs, reproduces or repairs, or
offers to furnish, supply, construct, reproduce, or repair oral
prosthetic appliances (known also as "Plates"), bridges, or other
substitutes for natural teeth, to the user or prospective user thereof.
This sub-section shall have no application to any person who is the
holder of a dental degree who does not, either directly or indirectly,
practice, or attempt to practice, dentistry as hereinbefore set forth
in this section.

18.    Persons exempt from article.

Nothing in this article shall apply to a bona fide student of den-
tistry in the clinic rooms of a reputable dental college; to a legally
qualified physician or surgeon unless he practices dentistry as a
specialty; to a dental surgeon [of the United States Army, Navy,
Public Health Service or Veterans Bureau,] in Federal dental serv-
ices in the discharge of his official duties; nor to a lawful practi-
tioner of dentistry of another state, territory or foreign country
making a clinical demonstration before a dental society, dental con-
vention, association of dentists, or dental college, or in performing
professional duties in connection with a specific case on which he
may have been called to the State of Maryland. Nothing in this
article shall apply to public school clinics, to State institutions, to
eleemosynary institutions, or to business corporations which may
maintain clinics for pupils, inmates or [employes] employees only
which shall employ only legally qualified dentists. No such public
school clinic, State institution, eleemosynary institution, or business
corporation shall advertise in any manner or by any method, either
directly or indirectly, anything relative to the practice of dentistry.
Such institutions are prohibited not only from advertising in viola-
tion of this article, but are prohibited from advertising in any man-
ner anything relative to the practice of dentistry. Nothing in this
article shall prohibit the dental division of the State Department
of Health, or [the director of the public school clinics of the city
health department] the health department of any political subdivi-