LIMITED POWER OF ATTORNEY - SECURITIES LAW COMPLIANCE
      The undersigned, as an officer or director of Align
Technology, Inc. (the "Company"), hereby constitutes and
appoints Roger E. George and Keneth B. Arola, and each
of them, the undersigned's true and lawful
attorney-in-fact and agent to complete and execute
such Forms 144, Forms 3, 4 and 5 and other forms as
such attorney shall in his discretion determine to
be required or advisable pursuant to Rule 144 promulgated
under the Securities Act of 1933 (as amended), Section
16 of the Securities Exchange Act of 1934 (as amended)
and the rules and regulations promulgated thereunder,
or any successor laws and regulations, as a consequence
of the undersigned's ownership, acquisition or disposition
of securities of the Company, and to do all acts necessary
in order to file such forms with the Securities and
Exchange Commission, any securities exchange or
national association, the Company and such other
person or agency as the attorney shall deem appropriate.
The undersigned hereby ratifies and
confirms all that said attorneys-in-fact and agents shall
do or cause to be done by virtue hereof.
      This Limited Power of Attorney shall remain in full
force and effect until the undersigned is no longer required
to file Forms 3, 4 and 5 with respect to the undersigned's
holdings of and transactions in securities issued by the
Company unless earlier revoked by the undersigned in a
writing delivered to the foregoing attorneys-in-fact.
      This Limited Power of Attorney is executed at Mountain
View, CA, as of the date set forth below.


			/s/Jennifer M. Erfurth
			Jennifer M. Erfurth
			Dated:   10/03/12
Witness:
/s/Yvonne Valiquette
Yvonne Valiquette
Type or Print Name
Dated: 	10/03/12







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