Hardness perception became better after implant rehabilitation, with a reduction of the error rate by 16% (Fig. 3). While five out of eight participants performed better in this test after rehabilitation, the results in the others were less clear. More detailed analysis showed that, despite wearing dentures, four participants were 100% successful in recognition of hardness before implant surgery, while four others had a 50% success rate, implying a response by chance. Noteworthy, three patients were able to chew and swallow a hard specimen immediately after implant rehabilitation.