Section 52. Any person who falsely asserts that he has a certificate granted by the board, or who, having such certificate or a duplicate thereof, fails to exhibit the same as required by section forty-five, or who falsely and with intent to deceive claims to be a graduate of any college granting degrees in dentistry, or who, except as permitted by section fifty-three, directly or indirectly practices or attempts to practice dentistry or dental hygiene or as a dental assistant without being registered under sections 45 to 511/2, inclusive, or corresponding provisions of earlier laws, or any registered dentist or incorporated dental company who employs or permits a person to practice dentistry unless such person is registered and exhibits his name and certificate as provided in sections forty-four and forty-five, or any person who violates any provision of sections forty-three to fifty-three, inclusive, for which no other penalty is provided, shall, except as provided in section sixty-five, be punished for the first offence by a fine of not less than one thousand dollars or by imprisonment for six months, or both; and for a subsequent offence by a fine of not less than two thousand dollars or by imprisonment for one year, or both; and any registered dentist who fails to exhibit his full name, as required by section forty-four, shall be punished by a fine of not more than fifty dollars; provided, that any corporation violating any provision of sections forty-three to fifty-three, inclusive, shall be punished by the fine herein provided for such violation, and its officers, owners or managers concerned in the violation shall be punished by the fine or imprisonment herein provided for such violation, or both.