Is it legal to perform Teeth Whitening without any qualifications or training?

Any dental procedure can only legally be provided by approved dental professionals (Dentists, dental hygienists, dental therapists, dental nurses) that have had suitable training for the procedures being carried out. Teeth whitening is considered to be practice of dentistry and can only be provided by registered dental professionals.

No, never it is not legal to perform teeth whitening without any qualifications or training because if something went wrong in the treatment then I would cause major issue and you are also going to punish for this.