Exhibit 10.28

14755 Preston Road, Suite 105
Dallas, Texas 75254
August 20, 2019
Biolase, Inc.
4 Cromwell
Irvine, CA 92618
Attn: John Beaver
Email: jbeaver@biolase.com
Re: Limited Forbearance Letter Agreement
Dear John:
Per our conversations, I understand that Biolase, Inc., (the “Company”) may fall out of compliance with the Consolidated Unencumbered Liquid Assets covenant set forth in Section 7.13.1(a) of the Credit Agreement by and among the Company, the lenders party thereto and SWK Funding LLC (the “Agent”), dated November 9, 2018, (as amended from time to time, the “Credit Agreement”) for the period ending September 30, 2019 (the “Potential LoanNon-Compliance”). Capitalized terms used in this letter agreement shall have the meaning set forth in the Credit Agreement unless otherwise defined herein.
The Company hereby represents and warrants that, except as it relates to the Potential LoanNon-Compliance, it is in compliance with all terms and conditions of the Credit Agreement and the other Loan Documents, and no Event of Default and no othernon-compliance has occurred and is continuing as of the date hereof.
As per your request, Agent, on behalf of itself and the Lenders, hereby agrees to forbear in exercising any right or remedy otherwise available to Agent or Lenders pursuant to the Loan Documents or otherwise available at law or in equity solely as it relates to the Potential LoanNon-Compliance. The forbearance provided for in the prior sentence shall continue until the earlier of (i) September 30, 2019, (ii) the closing of an Approved AR Loan Facility, or (iii) the occurrence of an Event of Default, as defined in the Credit Agreement, other than the Potential LoanNon-Compliance.
Upon the termination of the forbearance provided for above, Agent shall be entitled (but not required) to exercise any of its rights and remedies under the Credit Agreement, the other Loan Documents, or applicable law, including, without limitation, the right to enforce the liens on, and security interest in, the Collateral described in the Loan Documents, without further