Yeah. There are several available grants for funding dental clinics in the United States. Some of them are:
Health Resources and Services Administration (HRSA)
Delta Dental Community Care Foundation
Smiles for Success Foundation
DentaQuest Partnership for Oral Health Advancement
Americal Dental Association (ADA) Foundation
Colgate Bright Smiles, Bright Futures
Also, many U.S. states and local health departments offer grant opportunities dental clinics can qualify for. The federal government is not left out either.