I've had work done at Smile too. It's opposite the British Embassy near Ploenchit, Very satisfied with the work they did also except that they missed a large cavity under a filling in a back molar when I went for a check up once... they found it when I went to get my teeth cleaned two months later and by then it required an expensive root canal and crown to fix. I think I had a junior dentist for the routine check up, luck of the draw. This said the quality of the actual work they did (removing old fillings and scalings) was very good and it's very popular with foreigners.

Another place I've had good work done is the Bangkok International Dental Center (BIDC) ... roughly the same price as Smile but it's a larger and state of the art specialist dental center on Ratchadapesik road.

Both these places have websites if you do a google search.

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“Not all those who wander are lost.” Tolkien.
Life is not measured by the number of breaths we take, but by the moments that take our breath away.