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With such a fragmented view, there is no clear boundary between the pre-scientific approach and the scientific approach, although the application is becoming more and more aware of the scientific methods. Dental squad face mask. Critical method, always a work of great importance. Basically, both approaches can be described as approaches using the method of trial and error. We always try; That means, not only do we observe an observation, but we try to find more or less a limited number of practical problems, and then we will make progress if and only if you are always ready to learn from your own mistakes: be willing to acknowledge your mistakes and use them critically instead of continuing to uphold them sparingly thing.