He is a member of the Malaysian Chinese Association (MCA), a component party of the BN coalition.
On 13 June 2018, Teh was appointed as the Perlis State EXCO Member in Natural Resources, Environment, Biotechnology, Green Technology and Health by Menteri Besar Azlan.
He won the seat and was elected into the Perlis State Legislative Assembly as the Titi Tinggi MLA after narrowly defeating Teh Seng Chuan of Pakatan Harapan (PH), Kamis Yub of Gagasan Sejahtera (GS) as well as the independent candidate Yaacob Man by a majority of only 142 votes.
In the 2022 Perlis state election, Teh was renominated by BN to defend the Titi Tinggi seat.
He lost the seat and was not reelected as the Titi Tinggi MLA after losing to Izizam Ibrahim of Perikatan Nasional (PN) by a minority of 3,785 votes.