Vipeholm — the toffee experiments

Most of what dentistry knows about sugar was learned by destroying the teeth of people who could not consent.

Almost everything modern dentistry knows about how sugar destroys teeth rests on a decade of work at Vipeholm Hospital in Lund, an institution for people classed as intellectually disabled, most of them wards of the state.

What was done

Researchers commissioned by the Swedish Medical Board fed roughly 660 patients vast quantities of sweets — including a purpose-made extra-sticky toffee — up to eight times a day, and recorded the destruction of their teeth. The work was part-funded by the Swedish sugar and chocolate industries. None of the subjects could give informed consent. None were asked.

What it produced

The findings were real and important: sugar's damage depends on frequency and stickiness, not merely quantity. That result underpins preventive dentistry worldwide. One of the study's own researchers wrote, fifty years later, that no ethics committee today would approve it.

Sources

Bengt E. Gustafsson et al., 'The Vipeholm dental caries study: the effect of different levels of carbohydrate intake on caries activity in 436 individuals observed for five years', Acta Odontologica Scandinavica 11 (1954), pp. 232–364.
Bo Krasse, 'The Vipeholm Dental Caries Study: Recollections and Reflections 50 Years Later', Journal of Dental Research 80:9 (2001), p. 1785 — a participating researcher's own account, including that the study would not be approved today.
Elin Bommenel, Sockerförsöket: kariesexperimenten 1943–1960 på Vipeholms sjukhus för sinnesslöa (Arkiv förlag, 2006).

Penloom History — dark history you can trust. Every claim traced to a named archive, monograph, report or paper, and everything the record does not carry labelled where it sits. How we check a history fact before we repeat it →