If you notified either employer about your disability and you requested reasonable accommodations, then (assuming you can prove that notice was provided), you may have a disability claim against each employer under the California Fair Employment and Housing Act.
The issues are (1) whether or not you could have performed your job successfully with a reasonable accommodationl; (2) the employer had notice of the disability; and (3) the employer failed to reasonably accommodate you, despite the employer not suffering an undue hardship by providing a reasonable accommodation. Also, (4) the employer must employ at least 5 persons on a regular basis -- which could impact you, if the dentist is a very small business.
For examples of reasonable accommodations for ADD, see this link.
To file a charege of disability discrimination, see this link
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