How to deal with disputes when you cut your mouth with a bad toothbrush when staying in a hotel?

You can lodge a claim with the hotel or complain to the local consumer association.

With regard to the quality of goods and services in the Consumer Protection Law, consumers have the right to require them to meet the standards stipulated by the state or agreed with producers and operators, and shall not hinder consumption because of poor quality. If the goods or services provided by business operators do not meet the specified quality requirements, consumers have the right to demand repair, replacement, return, price reduction, etc.