Not necessarily. Nowadays, it is difficult to distinguish the texture of ceramics. Some ceramic bowls with poor quality cannot be put into the oven. :

Almost all the ceramics on the market are marked with the words "Suitable for microwave oven", but this does not mean that the porcelain will be fine in the oven. Ceramics that can be put into the oven actually have high requirements. The main raw material of ceramics is kaolin. High-quality kaolin is non-toxic and has little loss of microwave medium. Ceramics made from this kaolin can be put into the oven without toxicity.

However, some ceramics made of kaolin doped with metal impurities are not suitable for use in the oven. If they are put in the oven, they may be toxic and cannot be used. Colored ceramic bowls should not be put into the oven. When the oven is working, the highest temperature can reach 25℃, and high temperature may precipitate heavy metals in the pigment, which is harmful to human body.