How to resign legally

Based on the Labor Law of the Kingdom of Saudi Arabia, you do have the right to resign under these conditions.

There are several sections of the law which apply to your situation:

1. Article 82 of Saudi Labor Law states that the employer should give workers an annual paid vacation of not less than twenty-one days. If you have not received this, the company is in violation of the law.

2. Article 90 specifies that employees should receive overtime for any hours worked beyond their regular hours. If you're not being paid overtime, it's a violation of this section.

3. Article 38 specifies the working environment and tools provided by an employer should not pose a risk to the health of an employee. Working with non-sterilized equipment can be considered a health risk, and not following health regulations is a clear violation of this law.

The Saudi Labor Law also highlight the rights of the employee to leave the job without notice if the employer does not meet contractual obligations (Article 81) and if the employer has misled the worker at the time of contracting with regard to the terms of work (Article 80). It's recommended to discuss these violations with your employer or the Human Resources Department and keep a record of these conversations. If the company continues to ignore these violations, you are allowed to resign for cause without notice.