No, it is not recommended to use common tea and coffee mugs and cups in a conventional oven. Most regular mugs and cups are not designed to withstand the high temperatures of an oven, and they can crack, shatter, or release toxic substances when exposed to direct heat.
The materials commonly used for regular mugs and cups, such as ceramic, porcelain, or glass, may not be able to withstand the thermal shock caused by sudden temperature changes. When you place them in a hot oven, the rapid increase in temperature can cause the material to expand unevenly, leading to cracks or breakage.
Additionally, some mugs and cups may have decorative elements like metallic paint, decals, or coatings that can melt, release harmful chemicals, or create a fire hazard when exposed to high heat.
If you need to heat liquids in the oven, it is advisable to use oven-safe glassware or ceramic dishes specifically designed for oven use. These types of dishes are made from materials that can withstand high temperatures without breaking or releasing toxins.
Always check the manufacturer's instructions or markings on the bottom of the mug or cup to determine whether it is safe for oven use. If you're unsure, it's best to use alternative oven-safe containers to avoid any potential risks.