Pyrex glassware is designed to go in the oven and is safe in ovens up to 450 degrees Fahrenheit. The more wear and tear a Pyrex dish undergoes, however, the less oven-safe it becomes. In particular, scrubbing at burnt-on foods can take a portion of the special coating off.
When removing a Pyrex dish from the freezer, it is best to allow it to warm up to room temperature before placing it in a hot oven. Any glass dish, including Pyrex, can break if exposed to extreme temperature changes. Pyrex dishes are very durable otherwise, and they are one of the most well-known cooking products because of their wide range of uses.