Toni & Guy USA have a similar layout to the UK website. You go to the location or find a salon and choose the salon you want to visit. Click one the Services tab at the top of the page and scroll down to the Allergy Test Policy just after the prices for Technical treatments.
‘Allergy test policy – We recommend that all clients receive an allergy test prior to any technical service. An additional $5-10 may be added to any technical service for long or thick hair. Technical pricing does not include cutting or styling. At TONI&GUY we recommend booking a style out after all technical services in order to guarantee results.’