Dental Care Access Foundation offers sliding scale clinics, and also operates free cleaning clinics at certain times of the year. Please see their website for more information:
Reduced fee clinics:
https://www.dentalcareaccess.org/blank
Kids Free Cleaning Events:
https://www.dentalcareaccess.org/events
Florida Voices of Health has Dental Clinics listed in Lake County
Low cost Dental Care can also be found at this website