A 38-year-old male was referred to the Groningen University Hospital because of a swelling of the left lateral border of the tongue. The swelling existed for two weeks and complicated speech and chewing. The cause of the swelling was a sharp edge of a restoration in the 36, which repeatedly traumatised the lateral border of the tongue. Subsequently, additional chronic traumatisation was caused by interposition of the tongue between the teeth. Imprints of the teeth in the borders of the tongue were clearly visible. Wearing a tongue- shield prevented further traumatisation of the tongue and resulted in an almost full recovery of the swelling in two days. The filling was subsequently remade.