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Mr Roberts said the report also highlighted that young people are experiencing more bullying and have lower self-esteem than ever before.

At the time, Kelly was on a waiting list for traditional NHS talking therapy to discuss issues with anxiety, low self-esteem and a relationship breakdown.

The perfect smile can be the key to self-esteem, to happiness, to personal connection.

"And also just to build their resilience and self-esteem, which is obviously a skill which they need for life, to thrive in the world we live in," she added.

In a 1996 study comparing holotropic breathing and therapy, participants who did both breathwork and therapy said breathing increased their self-esteem and reduced their anxieties about death compared to those who received therapy only.