Dentists can take advantage of the small business instant asset write off, which allows you to fully deduct asset purchases up to $30,000 in the year they are purchased. This means that any upgrades to equipment that cost less than $30,000 can instantly reduce tax in the financial year they are purchased.
Dentists often have significant expenditure for education and travel-related expenses for conferences. It's possible to claim any education expenses directly relating to your profession that assist you in completing your job and improving your skillset.
You can also claim travel expenses for attending conferences, both in Australia and overseas. If there's an element of personal travel attached to the trip, this needs to be apportioned.