Effects of an oral hygiene punishment procedure on chronic rumination and collateral behaviors in monozygous twins.

Two identical twin boys with severe intellectual disability kept bringing food back up and re-chewing it. This is called rumination. It can cause weight loss and even death.

The team used a simple punishment. After each episode, staff gave the boys a sip of mouthwash and brushed their teeth for two minutes. They tracked ruminations across the day using a multiple-baseline design.

Rumination dropped to almost zero for both twins within days. The low level held for six months with no extra training.

Good behaviors like playing and eating went up at the same time. Staff needed only a bottle of mouthwash and a toothbrush.

Goldman et al. (1979) tried the same mouthwash routine three years earlier, but they also let two adults eat until full. Both studies wiped out rumination, so the food add-on may be optional.

Migan‐Gandonou et al. (2020) later swapped the brush for plain mouthwash and kept the gains for four years in a child with autism. This longer follow-up shows the effect can outlive the twins’ six-month mark.

Foster et al. (1979) compared overcorrection, time-out, and DRO for other oral stereotypies. Overcorrection worked fastest, but the mouthwash method is quicker to give and less intrusive.

If you work with clients who ruminate, keep a small cup of alcohol-free mouthwash and a spare toothbrush handy. One two-minute application after the first episode can stop the cycle before medical problems start. Track for one week; most clients show a sharp drop by day three.