Susan Boyle may need to have teeth whitening treatment before her new autobiography is released in the UK.

This is the suggestion of Contact Music, which said the singer’s teeth “appear to be discoloured” when she smiles.

SuBo was spotted wearing a red leather jacket as she made her way to St John’s hospital in Livingston, in her native Scotland.

Her autobiography, The Woman I Was Born To Be, is released later this month and detailed her life both before and after she shot to fame on Britain’s Got Talent.

She reveals she blames her father Patrick for ending one of her relationships in her 20s, as he warned the potential suitor off to protect her.

Last month, cosmetic dentistry expert Dr Joe Oliver told InStyle magazine that teeth whitening and dental veneers could help people to look ten years younger and could even result in a smile as dazzling as Cheryl Cole’s.