We recommend not using the cup if the inner layer is broken. The reasons are as follows:
1. Cups with damaged inner layers are not safe. It's troublesome to drink broken glass into your stomach.
2. It is not clear, nor easy to cut hands or breed bacteria.
3. The advantages of double-layer glass are environmental protection, health, safety, and low price, so there is no need to reuse it.
4. Even if it is not damaged or cracked, it is not recommended to reuse it.
