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        <ExplanationTxt>MDSF ACCOUNTS FOR UNCERTAINTY IN INCOME TAXES IN ACCORDANCE WITH ASC TOPIC, INCOME TAXES. THIS STANDARD CLARIFIES THE ACCOUNTING FOR UNCERTAINTY IN TAX POSITIONS AND PRESCRIBES A RECOGNITION THRESHOLD AND MEASUREMENT ATTRIBUTE FOR THE CONSOLIDATED FINANCIAL STATEMENTS REGARDING A TAX POSITION TAKEN OR EXPECTED TO BE TAKEN IN A TAX RETURN. MDSF HAS DETERMINED THAT THERE ARE NO UNCERTAIN TAX POSITIONS WHICH QUALIFY FOR EITHER RECOGNITION OR DISCLOSURE IN THE CONSOLIDATED FINANCIAL STATEMENTS AT JUNE 30, 2021. MDSF'S INFORMATION AND TAX RETURNS ARE SUBJECT TO EXAMINATION BY THE FEDERAL AND STATE JURISDICTIONS AND GENERALLY REMAIN OPEN FOR THE MOST RECENT THREE YEARS.</ExplanationTxt>
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      <SupplementalInformationDetail>
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      <RecipientTable>
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          <CityNm>GREAT BARRINGTON</CityNm>
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        <PurposeOfGrantTxt>TO INCREASE ACCESS TO DENTAL CARE.</PurposeOfGrantTxt>
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          <CityNm>DENVER</CityNm>
          <StateAbbreviationCd>CO</StateAbbreviationCd>
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        <PurposeOfGrantTxt>TO INCREASE ACCESS TO DENTAL CARE.</PurposeOfGrantTxt>
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      <RecipientTable>
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          <AddressLine1Txt>1035 CAMBRIDGE STREET SUITE 326</AddressLine1Txt>
          <CityNm>CAMBRIDGE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02141</ZIPCd>
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        <CashGrantAmt>15000</CashGrantAmt>
        <PurposeOfGrantTxt>TO INCREASE ACCESS TO DENTAL CARE.</PurposeOfGrantTxt>
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      <RecipientTable>
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          <CityNm>MEDFORD</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
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        <RecipientEIN>042103634</RecipientEIN>
        <IRCSectionDesc>170(B)(1)(A)(II)</IRCSectionDesc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE I, PART I, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>THESE GRANTS WERE TO PROVIDE INCREASED ACCESS TO DENTAL CARE. THE ORGANIZATIONS SUBMIT A REPORT BACK TO MASSACHUSETTS DENTAL SOCIETY FOUNDATION ON HOW THE GRANT MONIES WERE SPENT.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS PROVIDED TO THE TRUSTEES BEFORE FILING. THE EXECUTIVE DIRECTOR OF A RELATED ENTITY (MASSACHUSETTS DENTAL SOCIETY) REVIEWS THE RETURN PRIOR TO BEING FILED.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL BOARD MEMBERS SIGN THE CONFLICT OF INTEREST POLICY AND ANY CONFLICTS OF INTEREST ARE ANNOUNCED AT THE BEGINNING OF EACH MEETING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>AN EXECUTIVE DIRECTOR IS NOT COMPENSATED BECAUSE OVERSIGHT AND FINANCIAL SUPPORT ARE PROVIDED BY A RELATED ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>HARD COPIES AVALIABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THIS PROCESS HAS NOT CHANGED FROM PRIOR YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
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          <CityNm>SOUTHBOROUGH</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>01745</ZIPCd>
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        <PrimaryActivitiesTxt>PROMOTE &amp; ADVANCE THE ART &amp; SCIENCE OF DENTISTRY &amp; INTEREST OF MEMBER DENTIS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
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          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>01745</ZIPCd>
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        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
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          <StateAbbreviationCd>MA</StateAbbreviationCd>
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        <EIN>043432374</EIN>
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        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <DirectControllingEntityName>
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      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
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      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>
