BANGKOK, Aug. 21 -- Thailand may be known as the Land of Smiles, but visitors looking to spruce up their teeth should take care to check who is holding the dental tools.

Thai police arrested five people yesterday accused of providing dental or medical services without licences in Bangkok, Samut Sakhon and Samut Prakan, seizing more than 1,000 items of medical and dental equipment, local news outlet The Thaiger reported.

The Central Investigation Bureau's Consumer Protection Police Division carried out searches at five locations on Thursday with public health officials and other agencies.

Four people were arrested over alleged unlicensed dental work, while a fifth was accused of practising medicine without a licence.

Police seized 1,05...