Both "Zähne putzen" and "Zähne bürsten" are commonly used in German to refer to the act of brushing teeth. "Zähne putzen" directly translates to "cleaning teeth," while "Zähne bürsten" translates to "brushing teeth." Both phrases are widely understood and used interchangeably in everyday language. **

Good oral hygiene involves maintaining a routine of daily practices to keep your mouth clean and healthy. This includes brushing your teeth at least twice a day with fluoride toothpaste, flossing daily to remove plaque and food particles between teeth, and using mouthwash to kill bacteria. Regular dental check-ups and cleanings are also important to prevent and detect any oral health issues early on. Additionally, avoiding tobacco products and maintaining a balanced diet can contribute to good oral hygiene. **

The concept of usury price refers to an excessively high interest rate charged on a loan, often considered unfair or exploitative. On the other hand, regular price refers to the standard or customary price for a good or service. In general, usury price is considered unethical and may be regulated by laws, while regular price is based on market conditions and competition. It is important to be aware of usury practices and seek fair and transparent pricing in financial transactions. **

Private health insurance typically does not cover teeth whitening procedures, as they are considered to be cosmetic treatments rather than medically necessary. However, some dental insurance plans may offer coverage for teeth whitening as part of a broader dental care package. It's important to check with your insurance provider to understand what specific dental treatments are covered under your plan. **

Based on the information provided, it is not possible to determine if the friend has poor oral hygiene. The fact that the friend has not visited a dentist in several years could indicate poor oral hygiene, but it could also be due to other reasons such as fear of the dentist, financial constraints, or simply not feeling the need to go. Without more information, it would be unfair to make assumptions about the friend's oral hygiene. **

Price increases occur when the demand for a product or service exceeds the supply, leading to higher prices. This can also happen when production costs increase, forcing companies to raise prices to maintain profitability. On the other hand, price decreases occur when there is an oversupply of a product or service, or when production costs decrease, allowing companies to lower prices to remain competitive. Both price increases and decreases are influenced by market forces, such as supply and demand, as well as production costs and competition. **

The price before the price increase was $40. **

The maximum price is set below the equilibrium price in order to prevent prices from rising too high and becoming unaffordable for consumers. By setting a maximum price, the government or regulatory body aims to protect consumers from price gouging and ensure that essential goods and services remain accessible to all members of society. This intervention is typically used in situations where there is a concern about market power or unfair pricing practices that could harm consumers. **