Chase, J.:

On August 19, 1895, when the affidavit of Walker was made, article 9 of chapter 25 of the General Laws, known as “ The Public Health Law” (Laws of 1893, chap. 661), had been generally amended by chapter 626 of the Laws of 1895. Said article relates to the practice of dentistry. As so amended it provides: “ Licentiates.— Only the following persons shall be deemed licensed to practice dentistry:

“ 1. Those duly licensed and registered as dentists in this State prior to the first day of August, eighteen hundred and ninety-five, pursuant to the laws in force at the time of their license and registration.

“ 2. Those duly licensed and registered after the first day of August, eighteen hundred and ninety-five, pursuant to the provisions of this chapter.” (§ 160.)

It also provides for a State Board of Dental Examiners (§ 161) and it also provides that such board shall, in connection with the *90Regents, make rules for the examination of candidates for license to practice dentistry. (§ 162.) It also provides who shall be entitled to take such examinations. (§ 162.)

It also provides: Licenses.— On certification by the board of dental examiners that a candidate has successfully passed the examination and is competent to practice dentistry the regents shall issue to him their license so to practice pursuant to the rules established by them. Upon the recommendation of the board, the regents may also, without the examination hereinbefore provided for, issue their license to any applicant therefor who shall furnish proof satisfactory to them that he has been duly licensed to practice dentistry in any State or country after full compliance with the requirements of its dental laws, and has been thereafter lawfully and reputably engaged in such practice for five years next preceding his application ; provided, that his preliminary and professional education shall have been not less than that required in this State. The regents may also license any applicant on the certificate of the board that after due investigation or examination it finds his education and professional attainments and experience of not less than five years in actual practice to be together fully equal to the requirements for license in this State. Every license so issued shall state upon its face the grounds upon which it is granted and the applicant may be required to furnish his proofs upon affidavit.” (§ 162.)

It also provides: “Registration.— Every person practicing dentistry in this State and not lawfully registered before this act takes effect, shall register in the office of the clerk of the county where his place of business is located in a book kept by the clerk for such purpose, his name, age, office.and post-office address, date and number of his license to practice dentistry, and the date of such registration, which registration he shall be entitled to make only upon showing to the county clerk his license or a duly authenticated copy thereof, and making an affidavit stating his name, age, birthplace, the number of his license and the date of its issue, that he is the identical person named in the license, that before receiving the same he, complied with all the preliminary requirements of this statute and the rules of the regents and board as to tlié terms and the amount of study and examinations; that no money, other than the fees prescribed by this statute and rules, was paid directly or *91indirectly for such license, and that no fraud, misrepresentation or mistake in a material regard was employed or occurred in order that such license should be conferred. The county clerk shall preserve such affidavit in a bound volume and shall issue to every licentiate duly registering and making such affidavit a certificate of registration in his county, which shall include a transcript of the registration. Such transcript and the license may be offered as presumptive evidence in all courts of the facts stated therein.” (§ 162.)

Since 1895 said article of the Public Health Law has been amended by chapter 297 of the Laws of 1896, chapter 355 of the Laws of J898, chapter 215 of the Laws of 1901 (sections renumbered), and chapter 210 of the Laws of 1902, but the changes do not affect the question as to whether the clerk of Rensselaer county rightfully registered said Walker as a dentist on August 19, 1895, and do not in any way confirm or ratify said registration.

As Walker was not duly licensed and registered as a dentist in this State prior to August 1, 1895, it was absolutely necessary for him to obtain a license from the Regents of the University of the State of New York to entitle him to registration after that date. He has never obtained such a license and the affidavit presented by him to the clerk of Rensselaer county not only did not comply with the statutory requirements but wholly failed to present to such clerk any authority or justification for registering Walker as a dentist.

Public interest demands that a true register of dentists be kept, and provision is made in the statute to prevent an erroneous registration of dentists by providing that a county clerk who knowingly shall make or suffer to be made upon the book of registry of dentists kept in his office any other entry than is provided for in section 169 shall be liable to a penalty of fifty dollars to be recovered . by the State Dental Society in a suit in any court having jurisdiction. (Pub. Health Law [Laws of 1893, chap. 661], § 162, as amd. by Laws of 1895, chap. 626; Laws of 1896, chap. 297, and amd. and renumbered as § 169 by Laws of 1901, chap. 215.) The statute makes provision for revoking licenses and canceling the registration of dentists when the holders thereof are found guilty of unprofessional or immoral conduct or of gross ignorance or ineffi*92ciency in their profession or are convicted of a felony (Pub. Health Law [Laws of 1893, chap. 661], § 162, as amd. by Laws of 1895, chap. 626, Laws of 1896, chap. 297, and amd. and renumbered as § 169b by Laws of 1901, chap. 215), but no provision is made in the statute for the revision and correction of the list of registered dentists in the office of the several county clerks or for canceling the registration of a dentist who has by inadvertence or design been registered by a county clerk without having been licensed as provided by statute.

While a person cannot practice dentistry without subjecting himself to punishment unless he is licensed to practice as such and registered (Pub. Health Law [Laws of 1893, chap. 661], § 164, as amd. by Laws of 1895, chap. 626; Laws of 1898, chap. 355, and amd. and renumbered as § 169d by Laws of 1901, chap. 215), the remedy for avoiding a possible color of title by reason of an erroneous and illegal registration is not specifically provided. A mandamus is only allowed against a ministerial public officer when a person has a legal right which he is entitled to enforce and the ministerial public officer whose duty it is to enforce the right refuses to perform his duty. So the right to a mandamus in this case to compel the defendant to cancel the registration of Walker depends upon the question whether it was the duty of the defendant at the request of the relator to cancel and erase the registration of Walker without the mandamus. It would be dangerous to assume that clerks of courts and of counties, without special statutory authority or regulation or the judgment of a court therefor, are authorized to physically erase and destroy records made by them or by their predecessors in office and remove papers from their files upon the suggestion of an individual or of a gxiasi public corporation that the record or entry should not have been made or the paper filed. (See Matter of Molineux v. Collins, 177 N. Y. 395.)

The registration of Walker in the office of the clerk of the county of Rensselaer was made on the 19th day of August, 1895. The defendant came into office as the clerk of the county of Rensselaer on the first day of January preceding the application for this writ in June, 1904. The defendant was asked by the relator to cancel and expunge from the record in his office the entry of the *93name of William E. Walker on the book of registry of dentists in said county, and also to cancel and remove from the files of his office the said affidavit of William E. Walker. We do not think that it was the defendant’s public duty to comply with the request.

It may be stated as a general proposition that the office of the writ of mandamus is to compel the performance of an act which the law specifically enjoins and not to undo an act already done. (13 Ency. of PI. & Pr. 497; 19 Am. & Eng. Ency. of Law [2d ed.], 743.) The authorities referred to us by the relator are based upon a judgment of a court or upon some statute expressly relating thereto and authorizing the act which the ministerial officer refused ■or neglected to perform. Thus, in People ex rel. Livingston v. Taylor (45 Barb. 129), it was held that a mandamus would lie to the commissioner of jurors to compel him to strike from the list of jurors the name of a person not liable to jury duty. The authority for the writ there considered was section 3 of chapter 495 of the Laws of 1847, which provides that after notice published, as in the statute prescribed, stating that the jury list was “ ready for examination and correction,” that then “ the names of all persons found to be exempt from serving as jurors shall be struck from the list and the ground of exemption recorded.” In that case there was a legal duty resting upon the commissioner of jurors and the specific remedy was properly enforcible by mandamus.

So in People ex rel. Ostrander v. Chapin (105 N. Y. 309) it was held that a writ of mandamus would issue to compel the Comptroller to cancel a tax sale and refund the purchase money where the purchaser alleges and presents proof to show that the tax was invalid. This decision rests, however, upon section 83 of chapter 427 of the Laws of 1855, which provides : “ Whenever the comptroller shall discover prior to the conveyance of any lands sold for taxes that the sale was for any cause whatever invalid or ineffectual to give title to the lands sold, the lands so improperly sold shall not be conveyed, but the comptroller shall cancel the sale and forthwith ■cause the purchase money and interest thereon to be refunded out of the State treasury to the purchaser, his representatives or assigns.”

So in many cases relating to the cancellation of taxes and tax sales and for the removal of exempt property from assessment rolls *94there is by virtue of the statutes a legal, right in the relators to have the administrative officer perform specific duties for a specific purpose.

In other cases where mandamus has been issued to compel the correction of records the authority for the writ is based upon the fact that until the record is correctly made the legal duty resting upon the administrative officer has not been performed.

In this case, when Walker in August, 1895, presented his affidavit to the clerk, the facts contained therein were wholly insufficient to entitle him to registration and there was nothing for the clerk to do-—no legal duty to perform. The registration was a distinct and completed act wholly outside of public duty. When a paper is filed in a public office, although the paper is insufficient for the purpose intended, and entries are made by a,public officer not authorized by the paper so filed, it cannot be said to be the duty of a successor of such public officer to remove such paper from the files of the office and cancel the entries made in asstimed compliance with such paper unless there is some statutory authority or judgment of a court of competent jurisdiction therefor. So the failure of the defendant to cancel and expunge the name of Walker from the register of dentists and to remove from the files of his office the affidavit so made by Walker was not such a failure to perform a clear ministerial public duty as to require the court to direct by mandamus that such cancellation be made and that such paper be removed from the files.

We regret that we are unable to reverse the order and direct the cancellation of the registration at this time. Application should be made to the Legislature for authority by the several county clerks under appropriate regulations to correct the registration of dentists in their several offices on application therefor and on notice to the person or persons interested and for a review of the determination of such clerks by the courts.

The order should be affirmed, without costs.

All concurred.

Order affirmed, without costs.