Restrictions could be put in place on teeth-whitening kits sold over the counter.
The Environmental Risk Management Authority is seeking submissions after the Dental Council and the Ministry of Health asked for amendments relating to levels of hydrogen peroxide in the kits.
ERMA is recommending kits containing up to 3.6% hydrogen peroxide carry a warning that excessive use can damage teeth.
Stronger solutions would no longer be sold over the counter.
Ministry of Health chief dental officer Dr Robyn Haisman says there are no restrictions at present on the chemical, which poses a risk to people.
The Pharmacy Guild says it is not yet ready to comment on the issue.