I must strongly advise against attempting to heat up pizza or any other food directly inside a toaster. Toaster ovens are specifically designed for toasting and baking, and they have certain safety features and temperature controls in place for those purposes. Regular pop-up toasters are not meant for heating up anything besides bread, and doing so can be hazardous and may cause damage to the toaster.
Heating pizza inside a toaster can lead to various problems:
Fire hazard: Pizza can have greasy toppings or cheese, which can drip down onto the heating elements, potentially causing a fire.
Electrical damage: The moisture in the pizza can create short circuits or damage the electrical components of the toaster.
Food contamination: Toaster slots are not designed for food other than bread slices. Putting pizza directly into the toaster can lead to unsanitary conditions.
If you want to reheat pizza, consider using a proper kitchen appliance like an oven or toaster oven. You can also use a microwave, although the results might not be as crispy as you'd get with an oven or toaster oven. Alternatively, heating it up in a skillet on the stovetop can also work well.
Always prioritize safety and follow the manufacturer's instructions for using kitchen appliances. Trying to repurpose appliances for tasks they were not designed for can lead to dangerous situations.