。。
We perform treatments like whitening. We also offer cleanings such as tartar removal.
Literal
Whitening [things-like-など] [gen-の] treatment [obj-を] perform [polite-ます]. Tar-removal [things-like-など] [gen-の] cleaning [also-も] are-performing [polite-ています].
A service-business announcement style with parallel sentences using 行う, the stiffer/formal synonym for する typical of medical and business writing. など 'and so on / such as' marks non-exhaustive examples. ヤニ is the everyday word for tar/nicotine residue — here specifically the brown stain on teeth from smoking. The first sentence uses plain 行います (simple present), the second uses 行っています (ongoing/habitual), a subtle shift between 'we'll perform (on request)' and 'we regularly offer (as a service).'