US corona measures vary widely between states.

In Alaska, entrants must quarantine or take a coronation test - in Florida, there are no restrictions at all.

But just like in Sweden, they have tried to avoid shutting down society.

Both countries have endured much criticism, but Scott W Atlas, the president's corona adviser, believes it is the right decision.

- The shutdowns have ruined people's lives, he says.

Atlas thinks it is naive to think that we can stop all spread of the coronavirus.

Instead, the individuals who may die from the virus should be protected, and Atlas believes that Sweden has tried to do so.

- Sweden has done something very smart.

The strategy has been to prevent the infection from affecting risk groups, not to stop the cases of infection among low-risk groups, he says.

"This is not China"

The United States, like Sweden, has not introduced any national requirements for oral protection.

Atlas believes that there is no evidence that mouth guards stop the spread of infection.

However, several states have introduced their own restrictions, which have been heavily criticized by the Trump administration.

- This is not China.

We do not put people in jail for not wearing mouth guards.

They know the guidelines and can do as they please, says Atlas.

Mouth protection - a political issue

However, the issue of oral protection is no longer just about science - it has become political.

Shana Gadarian, a professor of political science at Syracuse University, has studied how Republicans and Democrats view corona measures.

- The data we have collected shows that Republicans largely follow the recommendations of the infection control authority - they just do not do it as much as Democrats, she says.

Gadarian believes it has to do with the policies pursued by Republicans:

- Due to the party's focus on freedom and choice, there are many Republican leaders who have decided that you do not need to wear a mouth guard if you do not want to.

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"There are many Republican leaders who have decided that you do not have to wear a mouth guard if you do not want to," said Shana Gadarian, a professor of political science.

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