This may qualify as
an Education Credit, per the IRS, "An eligible educational institution is
any college, university, vocational school, or other postsecondary educational
institution eligible to participate in a student aid program administered by
the U.S. Department of Education. It includes virtually all accredited public,
nonprofit, and proprietary (privately owned profit-making) postsecondary
institutions. The educational institution should be able to tell you if it is
an eligible educational institution."
If the dental assistant school falls within this IRS eligibility information, then the
institution or school would have issued you a Form 1098-T, as a result. I would
suggest confirming with the school.
If so & once
confirmed, you would need to click Federal Taxes, then click
Deductions & Credits, look for Education, Expenses and
scholarships.
In order for this to be deducted as a job-related expense, it
must be for education that maintains or
improves your skills or that meets legal or employer requirements and to
maintain your current employment, status or pay level. However, education
necessary to meet an employer’s minimum
requirements for a new position or to qualify for a new trade or business is not deductible.