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Sure.

This is how to reset your preferences in Photoshop: Press-and-hold Command-Option-Shift on a Mac or Ctrl-Alt-Shift on a PC, while you start Photoshop. As you start the program you will get a pop-up dialog asking you if you would like to delete the settings file. Deleting the file will create a new set of preferences from scratch.

To reset a tool.

Go to the TOOL PRESET PICKER located in the top left had corner of the TOOL OPTIONS BAR.

Right click and choose RESET TOOL.

or

Click on the down arrow and a window will open.

On the top right hand side of that widow will be a gear icon…click on this and choose RESET TOOL.