Not all chinese dental cams are the same. I tried this route, and i wasn't too happy with the kludged results myself.
Unfortunately, i have 3 or 4 different snake cameras for less than $100, which all have their deficiencies, too.
In the end, i ended up using a friend's cheapo harbor freight camera with an effective mirror, which seemed to work out the best so far.
#40533 RV-10 Builder and CFI
1/2006 Started build
10/19/2011 First flight