Amendment Letter between Sirona Dental Systems, Inc. and J.P. Morgan Europe Limited, dated January 19, 2007, to the Senior Facilities Agreement among Sirona Dental Systems, Inc., Schick Technologies, Inc., Sirona Dental Systems GmbH, Sirona Dental Services GmbH, Sirona Dental Systems LLC, Sirona Holding GmbH, Sirona Immobilien GmbH, J.P. Morgan PLC, UBS Limited, JPMorgan Chase Bank, N.A., and J.P. Morgan Europe Limited, dated November 22, 2006

(ii)

For the purposes of the definition of “Change of Control” in this Clause 11.7:

(A)

“acting in concert” means, a group of persons who, pursuant to an agreement or understanding (whether formal or informal), actively co-operate, through the acquisition by any of them, either directly or indirectly, of shares in the Company, to obtain or consolidate control of the Company;

(B)

“control” means, in relation to the Company, the power (whether by way of ownership of shares, proxy, contract, agency or otherwise) to:

(i)

cast, or control the casting of, more than one half of the maximum number of votes that might be cast at a general meeting of the Company; or

(ii)

appoint or remove all, or the majority, of the directors or other equivalent officers of the Company; or

(iii)

give directions with respect to the operating and financial policies of the Company generally which the directors or other equivalent officers of the Company are obliged to comply with;

(C)

“continuing directors” means directors of the Company who were immediately prior to the occurrence of any event or circumstance that would (but for the proviso set out in sub-paragraph (a)(i) above) result in a Change of Control, directors, nominees of such directors or nominees of the Initial Investors.”;

(c)

the table in paragraph (a) of Clause 12.3 (Margin Ratchet) shall be deleted and replaced with the following:

“      Column 1            

Column 2

Relevant Ratio

Margin % per annum for Facility A1, A2 and Revolving Facility

Greater than 3.5:1

0.90

Equal to or less than 3.5:1 but
greater than 3:1

0.75

Equal to or less than 3:1 but
greater than 2.5:1

0.65

Equal to or less than 2.5:1 but
greater than 2:1

0.55

Equal to or less than 2:1

0.45

“;